iTHRVE hrv + craniosacral app has been designed to work with different sensors:
• iOS Camera (on your iPhone)
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• iOS Bluetooth Fingertip Pulse Oximeter – the recommended sensor
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• KYTO Ear clip Bluetooth sensor
KYTO Mobile Phone Heart Rate Monitor with Ear Clip
Mobile Phone Heart Rate Monitor with Ear Clip Sensor
• Polar chest strap
Polar H7 Bluetooth Chest Strap
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WATCH How to use the chest strap for doing overnight or long-term HRV recordings
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WATCH How to use a finger clip sensor to measure the pulse, HRV and blood oxygen
All of these sensors can be used for short recording (less than 30 minutes): mainly designed for coherence and breath training.
Long recording (up to 8 hours and a half), can only be done with the use of a Polar chest strap or a compatible Bluetooth chest strap device.
The pressure wave (related to the Mayer wave or Craniosacral wave) can only be displayed with the finger sensor.
The light sensors devices (Berry finger sensor, the earclip sensor and the iOS camera) are very sensitive to movements of the sensor: they need you to be quite still- when used to achieve a good acquisition of data.