Originally Posted by
Carbonfiberboy
Depends on what one calls a HRM. I use the term "HRM" to mean the sensor and readout combination. It's the readout that's expensive, not just the sensor. Used to be you could get a watch for $50 and the strap for $25.. Not anymore. Now everything's has to be way fancy with attractive whistles and bells. I like the Garmin Dual or Polar H10 straps and transmitters which also have both ANT+ and Bluetooth, connected to either a Polar watch or a Garmin bike computer. These 4-lead electrical sensors have ECG accuracy and are more reliable than optical sensors. That said, if your chest is really hairy you'll have
to shave where the electrodes go.
To me the HRM is just another BT/ANT+ sensor. The Polar OH1 has its own logging capability, but I use it with a Garmin head unit. My OH1 was less than £50 from memory. When worn on my upper arm I find it just as accurate and reliable as a chest strap. But I find it more convenient to wear. I find chest straps uncomfortable and a pita to use.