As living standards improve, a blood pressure monitor has become an essential medical device in households. Electronic blood pressure monitors are very convenient for measuring blood pressure, especially for patients with hypertension. They allow patients to measure their blood pressure timely and adjust medication dosages accordingly. How to read a blood pressure monitor varies with different models. Typically, on an electronic blood pressure monitor, the first line displays the systolic pressure, also known as high blood pressure; the second line displays the diastolic pressure, also known as low blood pressure; and the third line displays the heart rate. These readings can help you know your systolic and diastolic pressures.