Also subject to issues with temperature - for example on a cold day outside it'll be less accurate due to lower blood flow in the external limbs. Too much movement - throws off the result. The research shows the wrist is actually the best place for a watch but the worst for recording heart rate accurately via an optical HRM.
But if you don't need spot on accuracy they are "acceptable" to non-sports people. Long term update:I think I was a bit harsh about my criticism of the devices heart rate monitoring ability - so I've updated to 3 stars.Since this device I have also tried a few other optical wrist based HRMs and done a lot of research.What I've found is that in fact none of them are anywhere near chest strap accuracy. Reviewed in the United Kingdom on 6 October 2016
All the right heart beats but not necessarily in the right order
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