COROS VERTIX 2S

COROS VERTIX 2S is a watch from 2024, sitting in the flagship band at an indicative $699.

It reads 14 of the 33 signals this comparison tracks. Full coverage of activity. Nothing at all from body composition.

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, an optical blood oxygen sensor, a GPS receiver, a barometer and an accelerometer. Blood oxygen is measured through the night, not continuously through the day.

Its 40 days per charge are the 2nd longest of the 74 devices of its kind here that publish a figure. The transflective MIP screen can stay always on. Multi-band GPS. Rated 10ATM, fine for swimming. On top of the tracking it also handles music on the device and offline maps. Case size 50.3mm. No subscription is required.

Flagship ultra/expedition; MIP, dual-freq GPS, overnight HRV + SpO2.