Before revision: 300px|Smartwatch displaying a reading of 92 beats per minute A heart rate monitor (HRM) is a personal monitoring device that allows one to measure/display heart rate in real time or record the heart rate for later study.
After revision: 300px|Smartwatch displaying a reading of 92 beats per minute A heart rate moonitor (HRM) is a personal monitoring device that allows one to measure/display heart rate in real time or record the heart rate for later study.