Comfortable and simple to adjust, the pre-formed ComFit Cuff inflates around the entire arm to avoid incorrect cuff positioning ensuring a precise reading and expandable cuff fits standard and large arms. Blood pressure measurement values vary from the left arm to the right arm. The average is generally within 10 mmHg (millimeters of mercury) for most individuals. Omron home blood pressure monitors are generally designed for use on the left arm as they are validated through clinical studies using the left arm. You should talk to your doctor before using the right arm to take a measurement.