CMF Watch 3 Pro review on World Heart Day: How good are its heart-rate and health-tracking features?

With World Heart Day falling on 29 September, smartwatches are once again drawing attention to the health data they can collect from the wrist. The CMF Watch 3 Pro adds a new optical heart-rate sensor, 24-hour monitoring, sleep-tracking and the Activity Score, which is based on heart-rate data.Nothing's sub-brand, CMF, released the Watch 3 Pro as the successor to the Watch Pro 2. It features a 1.43-inch AMOLED screen, dual-band GPS, Bluetooth calling, 131 sports modes, and a 350mAh battery…