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Assures that the flowmeter is exactly vertical eliminating error caused by friction between the float and the flow tube
Clear outer case on allows for unobstructed view
Flow indicator with green paddle wheels go with the flow
A quick and easy way to test the safety of fume hood exhaust before use
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