Amazfit T-Rex 3

Amazfit T-Rex 3 is a watch from 2024, sitting in the mid-range band at an indicative $279.

It reads 18 of the 33 signals this comparison tracks. Full coverage of activity. Nothing at all from body composition.

By sensor class: 10 at consumer grade. That grade is my classification of the hardware, not a lab test. Those readings come from an optical heart rate sensor, an optical blood oxygen sensor, a skin temperature sensor, a GPS receiver, a barometer and an accelerometer. Blood oxygen is measured through the night, not continuously through the day.

Its 27 days per charge are the 13th longest of the 74 devices of its kind here that publish a figure. The AMOLED screen can stay always on. Multi-band GPS. Rated 10ATM, fine for swimming and diving. It weighs 68.3 g. On top of the tracking it also handles music on the device and offline maps. Case size 48mm. No subscription is required.

Rugged dual-band GPS adventure watch; readiness/training load, no ECG.