Timex fitness hrm

SOURCE: how to the HRM working

I assume that you do not have the instructions for your watch.


You can get instructions from the Timex web site "timex.com".

At the bottom of the screen click on "manuals/downloads", then on "product
manual download"

Enter your watch type in the search box and click on "search"

SOURCE: Timex M515 Heartb Rate Monitor in correct readings

I´m experienced the same problem of incorrect readings after a long time without use. I cleaned the rubber parts of the chest strap with soap and water, than I use some silicone grease or other silicon liquid to keep the rubber hydrated. Make a careful cleaning in the contact area between the rubber and the plastic parts, the fissure in these area use to be full of "sweat dust".