FIELD: various branches of industry, chemical, paint and varnish and food industries included. SUBSTANCE: device measuring surface stretching of liquid has pneumoacoustic unit with pneumatic vessel, generator of acoustic vibrations, former of plane acoustic wave and meter of sound pressure in the form of jet turbulent amplifier. Pneumoacoustic unit is made fast to jet element and displacement aid connected to control unit. Control unit is also connected to generator of linearly-rising pressure and to computer. Meter of displacement and flowmeter are connected to computer. EFFECT: increased accuracy of measurement of surface stretching of liquid. 1 cl, 2 dwg
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