Whether at home, in the office, or on the road, the MDF® 808 Calibra™ Pro Aneroid Sphygmomanometer Stethoscope is a traditional, easy-to-use blood pressure instrument that offers the convenience, portability, accuracy, and trouble-free operation ideal for home practitioners and self-administering users. Stress-tested over 3,000 times and calibrated 5 times, it is one of the most durable, accurate, and dependable blood pressure measurement devices on the market.