Archive · 29 Sep 2026
CMF Watch 3 Pro Offers Strong Health Tracking Features
The CMF Watch 3 Pro is a smartwatch that measures several parts of your health and exercise.
It can check your heart rate throughout the day and warn you if your resting heart rate is unusually high or low.
It can also estimate blood oxygen, stress and sleep.
During testing, its heart-rate and blood-oxygen readings were generally close to those from a pulse oximeter.
The watch can show different sleep stages and detect naps.
It turns activity and heart-rate information into an Activity Score to help users follow their habits.
Its GPS worked quickly and steadily during outdoor runs.
Using health tracking all the time reduced battery life to about six or seven days.
The watch is useful for noticing patterns, but its measurements are for personal reference and are not medical diagnoses.
The CMF Watch 3 Pro costs Rs. 7,999 in India and includes a new optical heart-rate sensor.
Heart-rate and SpO₂ readings were generally similar to those from a pulse oximeter during testing.
The watch supports 24-hour heart-rate, SpO₂ and stress monitoring, though continuous tracking reduces battery life.
Sleep tracking identified overall sleep, naps and REM, core and deep sleep stages, while Activity Score summarized daily activity.
Dual-band GPS performed reliably during outdoor runs, but the watch does not provide swim tracking.
- Who
- Nothing’s CMF sub-brand and users of the CMF Watch 3 Pro.
- What
- A review assessed the smartwatch’s heart-rate, health, sleep and fitness-tracking features.
- When
- The review was published in connection with World Heart Day on 29 September.
- Where
- The CMF Watch 3 Pro was reviewed in India, including during workouts, runs and sleep.
- Why
- To assess how effectively the watch collects and presents everyday health and activity data.
- Price
- Rs. 7,999 in India
- Heart-rate monitoring
- Automatic 24-hour monitoring with configurable high- and low-resting-heart-rate warnings
- Health measurements
- Heart rate, SpO₂, stress and sleep tracking
- Fitness features
- 131 sports modes, Activity Score, VO₂ max, training load and recovery data
- GPS
- Dual-band GPS supporting L1 and L5 signals, plus GLONASS, Galileo, BeiDou and QZSS
- Battery
- About six days with continuous health tracking, 5.5 hours of GPS use and some Bluetooth calls
- Charging
- A full charge took about 90 minutes using the bundled magnetic charger