I don't have one, but from reading DCRainmaker's reviews (highly recommended) and my own experience of radio waves underwater, it's difficult to get any HR signal underwater, but an optical wrist sensor paired to a watch on the SAME wrist is your best best. The signal breaks up underwater in a very short distance. Others have had success with a chest strap and a watch worn in their bra. If you don't need HR in realtime but use it only for debriefing, then I'm pretty sure some sensors will store the data for later upload, but I can't tell you which.



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