Fitbit Sense 2

Fitbit Sense 2 is a watch from 2022, sitting in the premium band at an indicative $299.

It reads 21 of the 33 signals this comparison tracks. Full coverage of activity. Nothing at all from body composition. Rarer readings it does take: AFib detection, ECG recording and sleep efficiency.

By sensor class: 2 at clinical grade and 13 at consumer grade. That grade is my classification of the hardware, not a lab test. Those readings come from an optical heart rate sensor, ECG electrodes, an optical blood oxygen sensor, a skin temperature sensor, a GPS receiver, a barometer and an accelerometer. It records an ECG and screens for atrial fibrillation. Those are screening features, not a diagnosis. Blood oxygen is measured through the night, not continuously through the day.

Its 6 days per charge are the 68th longest of the 74 devices of its kind here that publish a figure. The AMOLED screen can stay always on. Built-in GPS. Rated 5ATM / 50m, fine for swimming. It weighs 37.64 g. On top of the tracking it also handles contactless payments. Case size 40.5mm. No subscription is required.

Health smartwatch; only Fitbit w/ all-day cEDA stress, plus ECG/SpO2/skin-temp/GPS/altimeter.