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Same - something like a headless Apple Watch would be ideal. I legit just want HR tracking and connecting to a chest strap HR monitor, and no watch display, other than the current HR.

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Sounds like you want a heart rate monitor and not a watch.

I had an Epson Pulsense years ago. Looks like the PS-100 is still in sale and fits this description.

As far as I can tell there are no hr monitors that can connect to chest straps. If one did then instant purchase. But I like the other tracking and sync of Apple Watch too, that would be a bonus.

Polar watch does this?

I have a Garmin Fenix 6 that definitely can do this, I do it all the time. You can customize the display so that it only displays the heart rate, or e.g. the heart rate and heart rate zones. While the Fenix 6 is expensive, I think there are a whole bunch of watches in that segment at different price points that will do what you want.

I think the general category you're looking for is devices that support ANT+.

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