Small-Adult Cuff & Bladder For A & D Blood Pressure Units * Small Arm Size 5.1 - 7.9 (13-20cm) * 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 *