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Question About Timex Heart Rate Monitor M640
Does not record heart rate...

My Timex M640 no longer records myt heart rate. The battery in the chest strap has been changd but there is still no heart rate being shown. The functions on the watch continue to work.

Asked by Nancy on 08/31/2010 1  Answer

ManualsOnline posted an answer 13 years, 8 months ago

The ManualsOnline team has found the manual for this product! We hope it helps solve your problem. Get the Manual Here

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