Amazfit
The reality behind Amazfit T Rex Ultra 2 heart rate complaints
· By Endurance Wire
Image source: Zepp Health News smartwatch Wearables zepp health February 23, 2026 Marko Maslakovic 3 min read The Amazfit T Rex Ultra 2 has only just launched and several reviewers have flagged heart rate accuracy issues during running. This is not coming from a broken sensor, it is coming from the reality of strapping a thick 90 gram watch to your wrist and asking it to stay perfectly still at high intensity. Wrist based heart rate is all about one thing, keeping the sensor pressed cleanly against your skin. As soon as that contact starts to shift, the data gets messy or starts lagging behind what your body is actually doing.
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