Grit X2

Polar Grit X2 is a watch from 2025, sitting in the flagship band at an indicative $799.

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 66th longest of the 76 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 62 g. On top of the tracking it also handles offline maps. Case size 44.7mm. No subscription is required.

Smaller sibling below the Grit X2 Pro, EU mid-2025 and US autumn 2025. Identical health-signal set, sapphire glass, offline maps.