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HOLIDAY HOURS: Our facilities in the USA will be closed on Thursday, July 2nd and Friday, July 3rd in observance of Independence Day. We will resume normal business hours on Monday, July 6th.

Key Instruments Legacy Products

Variable Area Flow Meters (Rotameters)

Key Instruments GS-L Glass Tube Flow Meter

GS-L Series

Glass Tube Variable Area Flow Meters

Download Installation Manual

View Replacement Product

Key Instruments GS-M Glass Tube Flow Meter

GS-M Series

Glass Tube Variable Area Flow Meters

Download Data Sheet

View Replacement Product

Key Instruments Pocket Flow Meter

Pocket Series

Plastic Tube Variable Area Flow Meters

Download Data Sheet

Valves