Built-In Memory with Polar Beat: Polar H10 has a built-in memory for heart rate data from one training session. The data can be transfered to Polar Beat, Polar’s free fitness and training app.

Polar launches the new Grit X2 Pro, featuring an upgraded AMOLED display, dual GPS, longer battery life, and much more.

Find out more about how we test. The Polar H10 heart rate monitor first launched in 2017 and has become known as one of the best heart monitors on the market, thanks to its accuracy and ease of use.

The Polar H9 is Polar’s cheapest heart rate monitor chest strap and uses an ECG sensor like its pricier H10 monitor to promise accurate heart rate data during workouts. The H9 connects over ...