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I have read about this sensor, did you try? what do you think about it?
If you want a good guide about how to make complete breath respiratios you can my video; https://www.facebook.com/OCTUPLEYOGA/videos/687916194752759/

Hello Marcela, we have developed the sensor it can work on the lower chest or the abdomen. Thank you very much for the link. Bless your heart.