Adaptable for left-handed and right-handed. High precision bleed valve with fine adjustment and without wear. Microfilters that protect the purge valve and the measurement system. Special hardened beryllium copper wear resistant membrane. Pressure resistant membrane up to 600mmHg. Easy-to-read 2.5-inch (64mm) scale, 0 to 300mm Hg. Strong ABS housing. Tube connection at the top of the manometer for ease of use. Maximum error tolerance of +/- 2mmHg. Includes zippered vinyl case. Full variety of bracelet sizes and versions. Housing colors: grey, blue, saffron and green