The Forerunner 245's heart rate monitor is also highly accurate. I used a Polar H10 chest strap to compare results, and during a one-mile walk, the watch recorded 126bpm to the Polar's 128bpm
It monitors heart rate variability to measure your body's fatigue, so if you're still full at the end of a session, you know what to do. Find it on: Forerunner 255, 745, 955, Fenix, Epix Cadence COLAPOO 10PACK Multicolor Bands Compatible with Garmin Forerunner 245/645,20mm Soft Silicone Wristbands for Garmin 245 Music/645 Music/Venu/Venu Sq/Vivoactive 3 4.5 out of 5 stars 796 1 offer from $16.99 Heart Rate Monitoring stopped working. Indrajeet over 4 years ago. Garmin 245 is barely one month old and since yesterday HR monitor has stopped working. In HR widget, I see only three dash instead of reading ---. I have checked all settings- HR recording is on. Activity tracking is on.