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Series GR is a standard borosilicate glass tube flow meter for liquids or gases available in either 65 or 150 mm scale lengths with 100 point reference scales. Conversion charts and tables can be provided to permit multiple fluid and gas use with a single tube.

Optionally, direct reading scales can be provided. GR Series flow meters can be configured with a control valve on either the inlet, outlet or no valve at all; fittings can be specified in either aluminum, brass or stainless steel; valves can be specified in either brass or stainless steel; O-rings and seals can be provided in Buna-N, Viton® or other optional elastomers