FIELD: medicine. SUBSTANCE: piston 11 is designed for displacement of liquid inside cylindrical chamber, preferably in injection bottle of double-chamber type. Piston is made so that at least one of its end-face surfaces 12 is of convex form in released state of piston diameter. Degree of end-face surface convexity in released state provides for flat end-face surface 12 in compressed state at smaller diameter of piston. EFFECT: enhanced accuracy of measurement. 13 cl, 6 dwg
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