This only work while using the Broadcast Heart Rate function. It seems to be somewhat slow but usable. I do think that maybe all garmin device with this function will work.
Known to not work
Name
Notes
Apple AirTags
We can only count how many are currently not connected to a phone
Samsung SmartTags
Randomized mac addresses
Add to the list
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Footnotes
These can do eddystone and iBeacon at the same time, just pick iBeacon ↩↩2↩3