I use the Polar 625x Running Computer – a fantastic product.
But I recently became frustrated with the heart rate monitor transmitter (the chest strap) increasingly not sending its signal to the monitor (the watch). Here are the steps you should take to fix any transmission problems you might be having:
- Replace the transmitter battery – a dead battery is the most frequent cause of signal transmission problems
- Clean the strap with warm water – specifically, clean the shiny mesh material on either side of the plastic that rests on the middle of your chest
- Clean the contact points – this is what solved my problem
Following these steps will ensure your Polar heart rate monitor works (and smells!) as good as the day you bought it.