This Aneroid sphygmomanometer is precision-crafted and exceeds industry standards. The nylon cuff includes a clear and visible marking system to ensure correct application. The McKesson sphygmomanometer valves has filter screens to prevent dust development. The air release valve acts quickly to rapidly deflate the cuff. The circumference range is 12 to 17 cm. It's suitable for small adults and children. . WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov