DIGITAL FLOWMETER Flow Meter : Series 820 Features : Digital Flow Meter Accuracy : ± 0.5% using calibration factor ± 0.2% using liquid calibration Flow Rate : 2 to 20 GPM ( 8 to 76 LPM) Pressure Rating : 120 Psi ( 8.2 Bar) at 21º C Preset calibration measurement : Ounces, pints, quarts, Liters or gallon; Special unit of measure option Resetable cumulative totalizer : 9, 999 Master Totalizer : 10, 000, 000 Construction : Polypropylene Flexible ports for horizontal or vertical positioning Large easy to read numbers 360º Positionable ports Powered by two AA battery 1" Ports : 1" Only Compatible Fluids : Most Automotive Fluids ( except gasoline) mild acids very thick fluids and many industrial chemicals