We agree with Rob ter Horst. PhD: that Holder ECG devices: https://en.wikipedia.org/wiki/Holter_monitor are not the best choice to validate the accuracy of consumer grade heart rate monitors. But Holder ECG devices are (according to Wikipedia) suitable to monitor the heart rate of canine: https://en.wikipedia.org/wiki/File:Holter_monitor_on_canine.jpg foxes, wolves, jackals, and other members of the dog family: https://www.britannica.com/animal/canine …
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