Microtek's Automatic Upper Arm Blood Pressure Monitor device uses an oscillometric method to measure the arterial blood pressure and pulse rate. The arm cuff is wrapped around the arm and automatically inflated by an air pump. The sensor of the device catches weak fluctuation of the pressure in the arm cuff produced by extension and contraction of the artery of the arm in response to each heartbeat. The amplitude of the pressure waves is measured and is displayed by a digital value. This device is easy-to-use and its accuracy will facilitate your daily blood pressure regimen.