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A heart rate monitor is a device used to measure the frequency of a persons heart rate in real time. Heart rate monitors are usually made up of two elements a chest strap transmitter and a wrist receiver unit that displays and records data. Also available are strapless monitors (also known as the heart rate monitor watch) but these usually lack some of the functions of the original design. Features usually include average heart rate over a period of exercise, specific heart rate zones and detailed logging that can be uploaded to a computer. Heart rate monitors take a pulse reading by picki...