For home use, I’d choose the Entertech Flowtime Biosensing Meditation Headband as the best overall pick for readers who want a guided meditation device with biosensing feedback. The Stone Pro HRV Biofeedback Training Device stands out for structured, game-based heart-rate-variability practice, while the Reflect Orb Smart Biofeedback Device is a more streamlined app-focused option. The main tradeoff is between learning a specific body signal, such as HRV or EEG, and getting a simpler guided experience that asks less of you at setup. I also compare two pressure stabilizers and an electrotherapy device, which serve different training or wellness goals rather than meditation. Read on for the full breakdown and help matching a device to your needs.
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Key Takeaways
- The feedback method matters more than the label: the Stone Pro focuses on HRV, Flowtime and SereniBrain use headband-based sensing, and the pressure stabilizers track pressure changes during movement.
- Stone Pro is the clearest fit for deliberate HRV practice: its ear-clip sensor and Windows games favor structured sessions, but the computer-based setup is less convenient than app-led options.
- Flowtime and Reflect Orb serve different kinds of beginners: Flowtime pairs biosensing with meditation, while Reflect Orb centers on a smart-device and app experience.
- The two pressure stabilizers are specialized training tools: they may suit core or joint exercises, but they do not replace a general meditation or HRV biofeedback system.
- App access and platform compatibility can shape long-term use: check device requirements and what happens after included app access ends before choosing an app-dependent product.
| Stone Pro HRV Biofeedback Training Device with USB Ear Clip Sensor and 5 Games for Windows |  | Best for PC-Based HRV Training | Device type: HRV biofeedback training device | Sensor: USB ear clip | Included games: 5 | VIEW LATEST PRICE | See Our Full Breakdown |
| Pressure Biofeedback Stabilizer for Core and Joint Training |  | Best for Exercise-Based Pressure Feedback | Main material: Rubber | Airbag material: TPU | Airbag size: 23 × 15 cm | VIEW LATEST PRICE | See Our Full Breakdown |
| Entertech Flowtime Biosensing Meditation Headband |  | Best for Guided Meditation Metrics | Model: Flowtime (ET-BIO-001) | Weight: 29 g | Measurements: Brainwaves, heart rate, HRV, relaxation, attention, and pressure level | VIEW LATEST PRICE | See Our Full Breakdown |
| Reflect Orb Smart Biofeedback Device with 1-Year Premium App Access |  | Best for Simple Visual Breathing Feedback | Product type: Smart biofeedback device | Intended use: Stress relief, mindfulness, and relaxation | App compatibility: iPhone and Android | VIEW LATEST PRICE | See Our Full Breakdown |
| SereniBrain EEG Neurofeedback Headband for Meditation and Brainwave Monitoring |  | Best for EEG-Focused Home Practice | Model number: TH21A | Sensor type: EEG | Compatible devices: Smartphones and tablets | VIEW LATEST PRICE | See Our Full Breakdown |
| Pressure Biofeedback Stabilizer for Core Strength |  | Best for Core-Activation Practice | Product type: Pressure biofeedback core trainer | Target areas: Abdominals, lower back, and pelvic muscles | Design: Ergonomic | VIEW LATEST PRICE | See Our Full Breakdown |
| Denas-PCM 6 Biofeedback Electrotherapy Device |  | Best for Battery-Powered Electrical Stimulation | Device type: Electrostimulation and biofeedback device | Technology: Dynamic electrical nerve stimulation (DENS) | Menu languages: Russian, English, German, French, and Italian | VIEW LATEST PRICE | See Our Full Breakdown |
| Core Meditation Trainer with Premium App Access |  | Best for Guided Meditation Feedback | Connectivity: Bluetooth | Compatible devices: Apple and Android mobile devices | Guidance features: Lights and gentle vibrations | VIEW LATEST PRICE | See Our Full Breakdown |
More Details on Our Top Picks
Stone Pro HRV Biofeedback Training Device with USB Ear Clip Sensor and 5 Games for Windows
I’d choose the Stone Pro for home users who want heart-rate-variability feedback on a Windows computer rather than a meditation-focused app. Its USB ear clip sensor feeds data to five interactive games, giving practice a more task-based structure than the light-guided breathing on the Reflect Orb. Unlimited profiles also make it easier for several people to keep their sessions separate, while wavelet analysis, Poincaré plots, and Fourier transforms offer more detailed data than a simple visual cue. The tradeoff is a distinctly computer-centered setup: it requires compatible Windows software, and it won’t suit someone who wants a standalone device or phone-first routine. It is a wellness accessory, not a medical device, so I’d treat its analytics as training feedback rather than diagnosis.
Pros:- Five interactive games provide structured, real-time biofeedback practice.
- Unlimited user profiles support shared household use.
- Advanced HRV analytics include wavelet analysis, Poincaré plots, and Fourier transforms.
- USB ear clip sensor creates a direct PC-based setup.
Cons:- Requires a compatible Windows PC and downloadable software.
- Its computer-based game format is less suited to phone-first or device-free meditation routines.
- Not a medical device and should not be used for diagnosis.
Best for: Windows PC users who want game-based HRV practice, detailed analytics, and separate profiles for multiple household members.
Not ideal for: People without a compatible Windows computer, or buyers seeking mobile-guided meditation or medical assessment.
- Device type:HRV biofeedback training device
- Sensor:USB ear clip
- Included games:5
- Software platform:Windows PC
- Compatible operating systems:Windows 7, 8, 10, and 11
- User profiles:Unlimited
- Analytics:Wavelet analysis, Poincaré plots, and Fourier transforms
- Medical status:Not a medical device
Our verdict“Choose the Stone Pro if you want PC-based HRV exercises and detailed session analysis; skip it if you need a portable, phone-led biofeedback routine.”
Pressure Biofeedback Stabilizer for Core and Joint Training
This stabilizer is the lineup’s exercise tool, not a substitute for an app-based meditation trainer. Its inflatable pressure bladder and target-area scale give users a physical reading to watch while practicing deep-core activation or joint stabilization. That makes the feedback more directly tied to movement than the Stone Pro’s HRV games or the Reflect Orb’s breathing light. The included instructional materials may help with home practice, but the product data does not specify a digital sensor, app, or extensive kit contents; the package lists one main body. Buyers need to learn correct placement and technique, since pressure readings only help when the exercise is performed consistently. I’d pick it for focused movement training, while skipping it for people seeking passive relaxation guidance or automated session tracking.
Pros:- Provides real-time pressure feedback during exercise.
- Target-area scale gives a visible reference during practice.
- Instructional materials support home training.
- Airbag is specified for over 100,000 inflation and deflation cycles.
Cons:- Correct placement and consistent technique are needed for the feedback to be useful.
- Package contents list only one main body, so buyers should not expect a digital app or broader accessory kit.
- Airbag dimensions may vary slightly.
Best for: Home exercisers who want a physical pressure reading while practicing deep-core activation and joint-stabilization movements.
Not ideal for: People seeking app-guided meditation, automatic data logging, or biofeedback that requires little setup and technique.
- Main material:Rubber
- Airbag material:TPU
- Airbag size:23 × 15 cm
- Airbag pressure resistance:20 kPa
- Air tube size:3 × 5 mm
- Airbag lifespan:Over 100,000 inflation and deflation cycles
- Package contents:Main body × 1
Our verdict“Choose this stabilizer for hands-on pressure feedback during core and joint exercises, not for app-led relaxation or meditation.”
Entertech Flowtime Biosensing Meditation Headband
The Flowtime headband is the clearest choice here for people who want meditation sessions paired with several kinds of body and brain feedback. At 29 g, it is designed to stay light during practice, while its smartphone app tracks brainwaves, heart rate, HRV, relaxation, and attention. Guided lessons suit users who want structure; unguided mode and minute-by-minute reports offer more room to practice independently than the Reflect Orb’s visual breathing cue. That breadth comes with more app dependence: a compatible iOS or Android phone is required, and access to all lessons requires a subscription. Unlike the Stone Pro, Flowtime is portable and meditation-centered, but it provides less of a PC-style analytics setup. Its lack of water resistance also means it needs more care around sweat and spills.
Pros:- Tracks brainwaves, heart rate, HRV, relaxation, and attention during meditation.
- Offers guided lessons as well as an unguided mode.
- Minute-by-minute biodata reports can help users review session patterns.
- Lightweight 29 g design and Bluetooth phone connectivity suit home or travel use.
Cons:- Requires a compatible smartphone and companion app.
- Access to all lessons requires a subscription.
- Not water resistant.
Best for: Meditators who want a lightweight, phone-connected headband with guided lessons and detailed reports across brain and body signals.
Not ideal for: Buyers who want full app content without a subscription, a standalone device, or equipment that can tolerate water exposure.
- Model:Flowtime (ET-BIO-001)
- Weight:29 g
- Measurements:Brainwaves, heart rate, HRV, relaxation, attention, and pressure level
- Connectivity:Bluetooth
- Compatibility:iOS and Android smartphones
- Operating system compatibility:Android 6.0 and iOS 14
- Battery life:About 8 hours of use; up to 50 days standby
- Water resistance:Not water resistant
Our verdict“Choose Flowtime if you want broad meditation metrics and guided app sessions in a lightweight headband; skip it if subscription access or water resistance matters most.”
Reflect Orb Smart Biofeedback Device with 1-Year Premium App Access
I’d point beginners toward the Reflect Orb if they want a visible cue for breathing and relaxation without wearing a sensor. It uses changing light to reflect body signals, making the session easier to follow at a glance than the Flowtime headband’s richer stream of brain and body metrics. Setup starts in the iPhone or Android app, but the Orb can then work independently, which suits a simple home routine. The included year of premium guided breathing, meditation, and session insights adds structure; after that, premium content requires a paid membership, although the biofeedback itself still works without renewal. Compared with the Stone Pro, this is less analytical and less game-like, but also less tied to a Windows computer. Its larger, tabletop-style form is not as portable as a headband.
Pros:- Changing light provides an easy-to-follow visual breathing cue.
- Can operate independently after app setup.
- Includes one year of premium guided breathing, meditation, and session insights.
- Biofeedback functionality remains available after premium access ends.
Cons:- Premium app content requires a paid membership after the included year.
- Battery life varies with use.
- Its tabletop form is less portable than the Flowtime or SereniBrain headbands.
Best for: Adults who want straightforward, screen-light breathing and relaxation feedback at home, with guided app content to get started.
Not ideal for: People seeking detailed brainwave or HRV metrics, a wearable for travel, or ongoing premium lessons without a subscription.
- Product type:Smart biofeedback device
- Intended use:Stress relief, mindfulness, and relaxation
- App compatibility:iPhone and Android
- Included membership:1 year of premium app access
- Battery type:Lithium-ion
- Battery life:Up to 2 weeks per charge, depending on use
- Dimensions:6.7 × 6.6 × 6.3 inches
- Age range:Adult
Our verdict“Choose the Reflect Orb for simple, visual home breathing practice; choose a headband instead if you want wearable brainwave data.”
SereniBrain EEG Neurofeedback Headband for Meditation and Brainwave Monitoring
The SereniBrain headband is the pick for buyers specifically interested in EEG-style feedback rather than broad physiological tracking. It monitors alpha, beta, and theta patterns in real time, with app-based guided meditation, neurofeedback exercises, and session history. The supplied carrying case, charging cable, and six signal-collecting pads make the kit feel more ready for repeat home sessions than the Stone Pro’s download-based Windows setup, though SereniBrain still requires a compatible smartphone or tablet. Compared with Flowtime, its stated feedback centers on brainwave patterns rather than a wider set of measures such as heart rate and HRV. The tradeoff is that EEG headband practice depends on sensor contact and app compatibility, and the product is for wellness training—not medical diagnosis. I’d choose it for brainwave-focused practice, not for a simple light cue like the Reflect Orb.
Pros:- Tracks alpha, beta, and theta brainwave patterns in real time.
- Companion app includes guided meditation, neurofeedback exercises, and session history.
- Hydrogel forehead sensors are designed for comfort and stable signal transmission.
- Includes a carrying case, USB charging cable, and six signal-collecting pads.
Cons:- Requires a compatible smartphone or tablet and companion app.
- Compatibility is limited to iOS 14 or higher and Android 10 or higher.
- Designed for wellness practice rather than medical diagnosis.
Best for: Meditation and focus practitioners who want real-time alpha, beta, and theta feedback and a portable EEG headband kit.
Not ideal for: People who want broad heart-rate and HRV tracking, a sensor-free relaxation device, or medical diagnostic equipment.
- Model number:TH21A
- Sensor type:EEG
- Compatible devices:Smartphones and tablets
- Operating system compatibility:iOS 14 or higher; Android 10 or higher
- Connectivity:Bluetooth
- Included components:Smart headband, storage carrying case, USB charging cable, user manual, and 6 signal-collecting pads
- Warranty:1 year
- Manufacturer:iHNNK Inc.
Our verdict“Choose SereniBrain if EEG-focused meditation feedback is your priority; opt for Flowtime for a wider mix of body metrics or the Reflect Orb for simpler visual guidance.”
Pressure Biofeedback Stabilizer for Core Strength
This is the most direct pick here for people who want feedback while practicing deep abdominal, lower-back, and pelvic-muscle activation. Its pressure-based approach gives home exercises a specific core-stability focus, unlike the Core Meditation Trainer, which centers on breathing and heart-rate feedback, or the Denas-PCM 6, which uses electrical stimulation. The power-free, portable design also makes it easy to keep in a home workout area or take to the office. The tradeoff is limited product detail: the description gives no dimensions or materials, so I can’t judge storage needs or construction. It also offers no stated app or progress tracking; buyers need to be comfortable practicing consistently without those digital prompts.
Pros:- Targets abdominal, lower-back, and pelvic-muscle activation
- Requires no power source
- Portable for home, office, or travel use
- Designed for beginners as well as fitness enthusiasts
Cons:- Dimensions and materials are not specified
- The description does not identify app-based guidance or progress tracking
- Benefits depend on regular practice
Best for: Beginners and fitness enthusiasts who want a portable, power-free aid for practicing deep-core activation at home or while traveling.
Not ideal for: Buyers seeking app-based records, detailed digital feedback, or a device with clearly listed dimensions and materials.
- Product type:Pressure biofeedback core trainer
- Target areas:Abdominals, lower back, and pelvic muscles
- Design:Ergonomic
- Size:Medium
- Power source:None required
- Use locations:Home, office, or travel
Our verdict“Choose this stabilizer if your priority is portable, focused core-activation practice rather than meditation feedback or electrical stimulation.”
Denas-PCM 6 Biofeedback Electrotherapy Device
The Denas-PCM 6 takes a different route from the exercise-focused Pressure Biofeedback Stabilizer for Core Strength: it uses dynamic electrical nerve stimulation and is described for drug-free pain relief and muscle recovery. That makes it a more specialized option for buyers seeking electrostimulation, not a general breathing or core-training tool. Its portable, two-AA-battery operation avoids a fixed power setup, and the five-language menu includes English, German, French, Italian, and Russian. The tradeoffs matter here: batteries are not included, and the product description notes contraindications without detailing them. I’d favor this over the Core Meditation Trainer only when electrical stimulation is the goal; buyers should review the device’s safety guidance and suitability before use.
Pros:- Uses dynamic electrical nerve stimulation
- Portable and powered by two AA batteries
- Menu supports five languages
- Includes an English-language printed manual
Cons:- Two AA batteries are required and not included
- The description notes contraindications but does not specify them
- Its electrostimulation focus is less suited to meditation or core-exercise feedback
Best for: Adults specifically seeking a portable DENS electrostimulation device for home use who are prepared to check its contraindications and operating guidance.
Not ideal for: People who want simple breathing or exercise biofeedback, dislike electrical stimulation, or need a device with contraindications fully explained in the product description.
- Device type:Electrostimulation and biofeedback device
- Technology:Dynamic electrical nerve stimulation (DENS)
- Menu languages:Russian, English, German, French, and Italian
- Power:Two AA batteries
- Batteries included:No
- Manual:English-language printed manual
- Use described:Drug-free pain relief and muscle recovery
Our verdict“Choose the Denas-PCM 6 only if portable electrical stimulation is your specific goal and you have checked its safety guidance.”
Core Meditation Trainer with Premium App Access
The Core Meditation Trainer is the strongest fit in this group for people who want guided breathing practice paired with measurable post-session feedback. Built-in lights and gentle vibrations cue breathing, while heart-rate biosensors—including ECG sensors—feed information to the Core app. Compared with the Pressure Biofeedback Stabilizer for Core Strength, it focuses on meditation rather than muscle activation; compared with the Denas-PCM 6, it guides practice without electrical stimulation. Its Apple and Android app adds guided sessions, recommendations, and progress tracking, but that connected experience also creates dependencies: a compatible mobile device and the app are required, and the description ties unlimited library access to Premium access. The natural wood body may appeal to buyers who want a less clinical-looking tool, though it is not a standalone option.
Pros:- Uses lights and gentle vibrations to guide breathing
- Measures heart rate and provides post-session feedback
- App offers guided meditations, recommendations, and progress tracking
- Natural wood design
Cons:- Requires a compatible Apple or Android device and the Core app
- Unlimited library access requires Premium access
- Less suited to muscle-activation training or electrostimulation
Best for: Meditation beginners or regular practitioners who want guided breathing cues, heart-rate feedback, and session tracking through a phone app.
Not ideal for: People who prefer a standalone device, do not want to use a mobile app, or are mainly seeking core-muscle or electrical-stimulation feedback.
- Connectivity:Bluetooth
- Compatible devices:Apple and Android mobile devices
- Guidance features:Lights and gentle vibrations
- Sensors:Heart-rate biosensors with ECG sensors
- Material:Natural wood
- App features:Guided meditations, personalized recommendations, and progress tracking
- Premium access:Unlimited library access with new classes, music meditations, and recommendations
Our verdict“Pick the Core Meditation Trainer if app-guided breathing and heart-rate feedback matter more to you than standalone or muscle-focused biofeedback.”
How We Picked
I ranked these biofeedback devices for home use by how clearly each product connects a measurable signal or exercise input to feedback a person can use at home. I weighed the stated sensing method, the ease of understanding the training purpose, setup demands, and the practical role of accompanying software or app access. A device aimed at HRV practice, meditation, pressure-guided movement, or electrotherapy should not be judged as if all four do the same job.
The ranking favors options with a clear home-training use and an understandable path from signal to session. That puts the Flowtime first for its meditation-oriented biosensing role, with Stone Pro close behind for more structured HRV training. The Reflect Orb and Core Meditation Trainer offer app-centered approaches, while the EEG headband and pressure stabilizers suit narrower preferences. The Denas-PCM 6 is listed for its distinct electrotherapy approach, but buyers should verify its intended use and seek qualified guidance rather than treating it as interchangeable with meditation biofeedback. I do not infer clinical effectiveness from product names or feature descriptions.
Factors to Consider When Choosing Biofeedback Devices For Home Use
Before choosing, decide what you want to observe or practice. Home biofeedback can mean tracking a body signal during meditation, using pressure feedback during movement, or following a different form of device-guided training. These factors can help you avoid buying a product whose feedback sounds appealing but does not match your routine.
Match the sensor to the skill you want to practice
Start with the signal, not the device’s wellness claims. HRV-focused tools are designed around heart-rate patterns, while EEG-style headbands focus on brainwave monitoring and pressure stabilizers respond to pressure changes during an exercise. Those measurements are not interchangeable, and a device that tracks one signal cannot automatically tell you about another. A common mistake is choosing the most impressive-sounding sensor without asking whether its feedback relates to a behavior you can practice. Pick the narrowest measurement that supports your actual goal, such as paced breathing, meditation, or movement control.
Check how feedback guides the next action
A number or graph is only useful if you know what to do with it. Look for clear session instructions, understandable feedback, and a way to connect changes in the signal with a specific practice. Games can make repeated HRV sessions feel more engaging, while guided meditation may suit someone who wants fewer decisions during practice. Raw monitoring can be less helpful for a new user who has no framework for interpreting the display. Avoid assuming that more data means more useful coaching; clarity often matters more than the volume of measurements.
Account for setup, fit, and your home routine
Home devices vary in how much preparation they ask of you. A sensor that clips to the ear, a wearable headband, a pressure tool used during exercises, and an app-linked device each create a different routine. Think about whether you will practice at a desk, on a mat, or while seated, and whether you are comfortable positioning a sensor consistently. Setup friction can turn a promising device into something you rarely use. Before buying, check what the manufacturer says about device placement, cleaning, connectivity, and supported computers or phones.
Look beyond included app access
Some products include app or premium access for a stated period, but that does not tell you what features remain afterward. Check whether sessions, history, coaching, or device functions depend on a continuing subscription or an account. Also confirm compatibility with your current operating system and whether the software works without an internet connection if that matters at home. A low-friction app may be worth prioritizing if you value guided sessions, while a computer-based tool may better suit someone who prefers structured training on a larger screen. Decide based on the routine you can sustain, not just the initial bundle.
Separate wellness practice from clinical care
Consumer biofeedback devices can support self-guided practice, but product descriptions alone do not establish that a device diagnoses or treats a health condition. This distinction matters most when a product uses medical-sounding language or a method such as electrotherapy. If you have symptoms, a diagnosed condition, implanted medical equipment, or questions about safety, ask a qualified clinician before use. Do not replace prescribed care with a home device or interpret a reading as a diagnosis. For routine wellness use, follow the maker’s instructions and stop if the device causes discomfort.
Pay for the use case, not the feature count
A higher feature count does not necessarily make a device a better match. Paying more can make sense when you will use a particular sensing method, guided program, or app feature regularly, but extra functions add little if they do not support your routine. For a beginner, simple instructions and low setup effort may matter more than advanced monitoring. For targeted exercise practice, a pressure stabilizer may be a better fit than a meditation headband, even though it is less versatile. Compare the ongoing costs and the specific job each device can do before treating premium positioning as a sign of better results.
Frequently Asked Questions
Which type of home biofeedback device is best for learning paced breathing?
Choose a device that pairs a relevant body signal with guidance you can follow during a breathing session. An HRV-oriented option such as the Stone Pro is aimed at structured HRV practice, while a meditation headband may fit better if you want feedback alongside meditation. The measurement itself does not teach breathing technique, so check whether the software explains how to use the feedback. If you want a general relaxation routine rather than signal-focused training, a guided app experience may feel easier to start with. Avoid choosing an EEG or pressure device just because it is marketed as biofeedback; its signal may not match your breathing goal.
Do I need a computer or phone to use these devices?
Requirements depend on the specific model, so check the maker’s compatibility information before purchase. The Stone Pro is described as using Windows games, making computer access part of its appeal and a potential limitation for phone-only households. Several other options are app-oriented, which can make mobile sessions more convenient but may rely on a compatible phone, account, or software access. Confirm that your operating system is supported and ask what functions remain if an app or included access period changes. Do not assume that a sensor will work independently just because it can be worn or connected.
Are pressure biofeedback stabilizers interchangeable with meditation devices?
No. A pressure stabilizer is designed around pressure feedback during core or joint exercises, while meditation-oriented devices focus on biosensing during a seated practice. The tool should match the activity: a pressure device may help you follow exercise cues, but it is not a substitute for HRV or EEG monitoring. The two stabilizers in this roundup also have similar broad roles, so compare their intended exercise use and instructions rather than expecting a meditation program. If you are using one for pain, rehabilitation, or a diagnosed condition, get guidance from a qualified professional.
Should I choose an EEG headband or an HRV device for home meditation?
Choose based on the kind of feedback you want, not on which signal sounds more advanced. HRV devices focus on heart-rate patterns, while an EEG headband is intended for brainwave monitoring; each presents a different view of a session. Consider which format the accompanying software explains clearly and which sensor you are willing to position consistently. If you mainly want guided meditation with biosensing, Flowtime is a meditation-oriented option in this lineup; Stone Pro is more focused on structured HRV training. Neither measurement should be treated as a stand-alone measure of meditation quality or health.
What should I check before buying a device that includes premium app access?
Find out how long included access lasts and which features depend on it. Check whether the app stores session history, provides coaching, or is needed for the device to function at all. Review the maker’s current terms, supported devices, and any ongoing charges rather than assuming the included access covers continued use. If you prefer not to depend on an app, favor a product with a clearly described standalone mode or software you can keep using. This check is especially useful when comparing app-centered options such as Reflect Orb and Core Meditation Trainer.
Conclusion
My best overall pick is the Entertech Flowtime for readers who want biosensing built around meditation. Choose the Stone Pro as the best value for structured HRV practice if a Windows-based, game-supported routine suits you; its value comes from that focused use, not from being a general-purpose device. For a more app-centered experience, the Reflect Orb is my best premium-style choice, while the Core Meditation Trainer is a straightforward option for beginners who want an app-led meditation routine. If you specifically want brainwave monitoring, look at the SereniBrain; for pressure-guided core or joint work, choose between the two stabilizers based on the exercises you plan to do. Treat the Denas-PCM 6 as a distinct electrotherapy option, not a substitute for meditation biofeedback, and seek professional advice if your use relates to a health condition.
