Medium-Adult Cuff & Bladder For A&D Blood Pressure Units * Medium arm size 7.5 - 12.2 (19-31cm) * Professional quality * Fits Lifesource digital blood pressure monitors * Using the correct size cuff is important for an accurate reading * A cuff that is too large will produce a reading that is lower than the correct blood pressure; a cuff that is too small yields a measurement that is higher * With your arm hanging at the side of your body measure the circumference of your upper arm at the midpoint between the shoulder and elbow * *