Why is my heart rate measurement inaccurate on Amazfit Cheetah 2 Pro?

Inaccurate heart rate readings often occur if the watch is worn too loosely or placed directly on the wrist joint. For the best accuracy, wear the strap about one finger's width away from the carpal bone and ensure it is tightened during workouts to maintain consistent sensor contact. Factors like arm hair, tattoos, and excessive arm sway can also interfere with the optical sensor's performance.