Forerunner 255
Garmin Forerunner 255 is a watch from 2022, sitting in the premium band at an indicative $349.
It reads 18 of the 33 signals this comparison tracks. Full coverage of activity. Nothing at all from body composition. Rarer readings it does take: Body Battery.
By sensor class: 10 at high accuracy and 3 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 during sleep, not continuously through the day.
Its 14 days per charge are the 43rd longest of the 80 devices of its kind here that publish a figure. The transflective MIP screen can stay always on. Multi-band GPS. Rated 5ATM, fine for swimming. It weighs 49 g. On top of the tracking it also handles contactless payments. Case size 46mm. No subscription is required.
Display/battery variant catalogued for the buy comparison; health-signal capability mirrors Forerunner 265.
Key specs
What it tracks
Heart & vitals
Sleep
Activity
Fitness
Sources
https://www.garmin.com/en-US/p/780139/https://www.dcrainmaker.com/2022/06/garmin-forerunner-multisport.html
Buying for battery life? See every device ranked by battery life
Your wearable's data, read against your own normal
MyBodyAI reads COROS, Garmin, Oura, Polar and Withings by logging in, and Fitbit and Pixel Watch through Google Health. Older Garmin history comes from a data export. It learns how you usually sleep and what your resting heart rate usually is, and every day shows where you stand against yourself: recovery, sleep, load and immune scores, a biological age estimate and early warnings. Optional, and separate from this comparison.
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