Based on discoveries by Dr. Richard Gerirtz and Paul Lehrer.
Simple Breathing Trainer with HR Wave Resonant Frequency option, breathing pacer and optional photofill games.
GP8 Owners: Want the latest software?
GP8-ECG Physiolab GP8 heart rate variability and respiration system $495.00
with all items listed in ECG kit and GP-5u respiration belt
An engineering marvel, PhysioData re-defines compact physiological monitoring!