I've been using my husband's 7-year-old $40 polar hr monitor. he bought me a jawbone up which i returned because it was really a fancy pedometer and not a heart rate monitor.. The heart rate sensor in apple watch uses what is known as photoplethysmography. this technology, while difficult to pronounce, is based on a very simple fact: blood is red because it reflects red light and absorbs green light..
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Over time, the apple watch has grown into quite the everyday heart rate monitor, but things have ramped up considerably with the new series 4 and watchos 5. after dipping into some basic heart.
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