The Go Direct respiration belt uses a load cell. Raw data can be optained from Vernier Grafical Analysis.

source: John Melville, PhD, Vernier

The Go Direct respiration belt can according to the manual also be connected to the Vernier mobile Android app.

https://www.vernier.com/product/go-direct-respiration-belt/

10.3.22

see also:

Consumer grade respiratory rate monitors ?

16.3.22

I had some issues with to Go direct pro.When I remove the Vernier Go respiration Belt from my chest and put it on a desk, the belt continues to measure force and respiration rate for 45 minutes. The data before and after the removal look very similar. This is quite strange. How can these data be interpreted? I will contact the Vernier support to inform about it.

20.3.22

For my personally, the Vernier Go Direct Pro Respiration Belt is not very comfortable to wear and needs constant attention to work properly, what interferes with breath meditation. Counting the number of breath during a minute with a Garmin watch which is programmed to vibrate once a minute is more secure and more comfortable.