25-1000 Soap film flowmeterDetailed product description：

The 25-1000 soap film flowmeter is generally used to calibrate the rotor flowmeter on atmospheric and dust samplers, and can also be used as a measuring instrument for measuring small flow rates of various gases.

Specification (ml)	Diameter (mm)	Height (mm)	Minimum scale (ml)
twenty-five	fourteen	five hundred	zero point five
fifty	eighteen	five hundred and fifty	five
one hundred	twenty-two	five hundred and sixty	five
two hundred	thirty-one	six hundred and twenty	ten
five hundred	forty-eight	five hundred and seventy	ten
one thousand	fifty-eight	seven hundred and ten	ten

Note: As it is a manually made glass tube, its actual diameter and height dimensions may differ from the dimensions indicated above.