Sphygmomanometer that withstands pressures of up to 600 mmHg. Specially hardened copper-beryllium membrane which is resistant to aging. Generously dimensioned scale (ø 147.2mm or 145.5mm) and high-contrast scale layout for optimum readability: scale up to 300 mmHg.Spacious basket on the reverse side for tubes and cuffs.Latex bulb to inflate the cuff. Non-wearing air-release valve with fine adjustment. Micro-filter to protect the release valve and measuring system. No zero-point fixation required. Maximum error tolerance: ± 3 mmHg.