If you have a Garmin fitness watch and want the most versatile heart rate monitor, this is the belt to buy. Key specs – Connectivity: Bluetooth, ANT+; Battery life: 12 months; Battery type
If the heart rate data is erratic or does not appear, you can try these tips. Reapply water to the electrodes and contact patches (if applicable). Tighten the strap on your chest. Warm up for 5 to 10 minutes. Follow the care instructions ( Caring for the Heart Rate Monitor). Wear a cotton shirt or thoroughly wet both sides of the strap. The Garmin HRM Run gives you a whole lot of extra metrics like cadence, oscillation, ground contact time, ground contact balance, stride length, and vertical ratio. If you want extra data that's the one to go for! The best for me has been the Polar OH1+. It's not a chest strap, it's an optical arm band.
Optical HR monitors, but easily circumvented, search this forum for a couple of threads on that. Garmin watches are no worse than others in that respect, and while newer sensors are generally a bit more accurate, it doesn't make a huge difference. Polar watches have the best OHR sensors in my view; but again, most people would not notice.

Garmin Fenix Pro 6X solar sport watch and heart rate PRO monitor with chest strap. The most recent iteration of Garmin’s straps, the HRM-PRO is the most advanced yet and, although originally designed for swimmers, it’s more than adequate for pretty much every sporting activity.

Instinct Heart Rate Monitor Inaccurate During Activity. 5185553 over 4 years ago. Bought my Garmin Instinct a little over a month ago to start tracking heart rate during my workouts. I do weight training, crossfit, and cycling. I've noticed that the heart rate is very low during my weight training along with the crossfit and is only accurate 9tcP.
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    • garmin heart rate monitor not accurate