Meanwhile, for HR accuracy testing I’m typically wearing a chest strap (either the Polar H10 or the Garmin HRM-PRO), as well as another optical HR sensor watch on the bicep (mostly the Polar Verity Sense, as well as the Whoop 4.0 band). Note that the numbers you see in the upper right corner of the charts below are *not* the averages, but HRM Pro / Forerunner 55. Thinking about a chest strap as the weather gets colder so I can have my watch on top of a long sleeve where I can easily see it. Currently wondering about the HRM Pro. Garmin lists the HRM Pro and Forerunner 55 as compatible but the 55 doesn't support running dynamics Hrm-Pro is the same as Hrm-Tri with the addition of being Bluetooth compatible in addition to Ant+. Hrm-Tri (and Pro) has ‘Store and forward’ meaning that they can record heart rate and upload it later when in range of the watch (eg when swimming or playing a sport without your watch). HRM-Run does not have this. The HRM-DUAL is nearly identical to Garmin’s past premium heart rate strap, except now it dual transmits on Bluetooth Smart as well. In fact, telling them apart at a distance can be tricky, but once up-close you can see the differences: And of course on the back you see the small Bluetooth Smart icon, as well as the previous ANT+ icon. Yes you have to pair it with Garmin Connect and Watch. If paired with garmin connect only, the strap will account for steps, activity minutes and HR “daily” metrics. But if you want to use HRM Pro for running cycling etc.. you have to pair it with watch. • 2 yr. ago. The new torch-equipped, go-anywhere watch costs £750, putting it very much in the luxury category alongside Apple’s £849 Watch Ultra and the £800 and up Epix line. That’s also £150 more HRM trio is Ant+ only I think. You’ll need a Bluetooth HR strap for the Apple Watch or iPhone. Damn, so this $130 HRM is useless for me then? I'm afraid so. I just looked it up: ANT+ only. If you can trade it in at Garmin, you can get a HRM-Dual and that should work with the native workout app on the Apple Watch. Optical Heart Rate Sensor vs. Heart Rate Chest Strap | Garmin Customer Support. FREE GROUND SHIPPING ON ORDERS $25 AND UP. Garmin Support Center. Garmin Support Center is where you will find answers to frequently asked questions and resources to help with all of your Garmin products. BgnHNNC.