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Assures that the flowmeter is exactly vertical eliminating error caused by friction between the float and the flow tube
A quick and easy way to test the safety of fume hood exhaust before use
Flow indicator with green paddle wheels go with the flow
Fisher Scientific - Bel-Art SP Scienceware Roto-Flo Polystyrene Flow Indicator for 7.9 to 11mm I.D. Tubing - Flow indicator with green paddle wheels go with the flow