FIELD: medical engineering. SUBSTANCE: device has positive and negative measuring chambers, membrane boxes placed inside of them, tightly connected to each other by means of canal and filled with liquid substance. The canal is transparent and the used liquid substance is heterogeneous and composed of two ingredients so that the boundary separating the ingredients is positioned in front of scale zero mark. The lower ingredient is dyed. EFFECT: enhanced reliability of device operation; enhanced accuracy of measurements. 3 cl, 1 dwg
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