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Jason, is there a chance that the strap is just not tight enough and it loses contact when your ribcage compresses with the depth?JasonWelbourne said:I think I have a polar b3, and I am fairly sure that it stops reading below 30. When I have taken it diving, it is fine during a static, but on dives below say 5 meters it starts reading 0bpm.
I also had a Timex HRM : this one (with 50 laps) ; which one did you have ?naiad said:I use a Timex heart rate monitor and it works well enough in the pool. I don't use it often, but it is useful to see what happens to my heart rate during static and dynamic.
Lucia
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