Brooks Instrument 1055A1, B-924-A-008-WA-A Flowmeter, 150C, volume calibration

Brooks Instrument 1055A1, B-924-A-008-WA-A Flowmeter, 150C, Used This is an old school volume calibration system, as you flow gas into the chamber the unit rises and you can measure the time you are flowing gas and calculate the volume, its how they used to calibrate rotometers and mass flow controllers. It is fragile, it hasnt been used in quite some time, but it was removed from the calibration lab as a working tool.