Professional Sphymomanometer The Sphymomanometer comes with an adult size cuff. Other sizes are available from A&D Medical. To determine the correct cuff size, measure the arm circumference at a point midway between the shoulder and elbow. Select the correct cuff size from the chart below. Infant 5.5"-7.5" (14-19cm) Child 7.5"-10.5" (19-27cm) Adult 11.5"-16" (29-41cm) Adult Large 13.5"-20" (34-51cm) Thigh 16"-23" (41-58cm) Additional cuffs are available A&am