Vantage M3

Polar Vantage M3 is a watch from 2024, sitting in the premium band at an indicative $499.

It reads 18 of the 33 signals this comparison tracks. Nothing at all from body composition. Rarer readings it does take: ECG recording and sleep efficiency.

By sensor class: 5 at high accuracy and 4 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. Those are screening features, not a diagnosis. Blood oxygen is a spot reading you take yourself, not a continuous one.

Its 7 days per charge are the 64th longest of the 74 devices of its kind here that publish a figure. The AMOLED screen can stay always on. Multi-band GPS. Rated WR50 / 50m, fine for swimming. It weighs 53 g. On top of the tracking it also handles offline maps. Case size 44.7mm. No subscription is required.

Compact multisport; AMOLED, dual-freq GPS, Gen 4 Elixir wrist ECG (wellness) + SpO2.