Specially designed so the user can easily set the gauge to zero if needed; Insert a mini-screwdriver (included) into the stem of the gauge and turn the screwdriver until the needle returns to zero. The Caliber Series offers proven reliability at an affordable price Designed for many years of demanding service in the hospital nursing home or EMT fields Caliber Series Sphygmomanometerss feature a blue aneroid gauge and matching calibrated blue nylon cuff Deluxe air release valve Twenty-year calibration warranty Zippered carrying case Contains latex Infant cuff fits an arm circumference of 5.5" to 7.8" Adult cuff fits an arm circumference of 11" to 16.4" Large adult cuff fits an arm circumference of 13" to 20"