Using the correct size cuff is important for an accurate blood pressure reading. A cuff that is too large will produce a reading that is lower than the correct blood pressure. While a cuff that is too small yields a measurement that is higher. If the LifeSource blood pressure machine you have purchased did not come with the correct sized cuff for you - or you plan to share your machine with other members of your household - then this comfortable and easy to use cuff will help you achieve your most accurate readings. 

To select the correct size cuff, measure the circumference of your upper arm halfway between the shoulder and the elbow.