This Fill-Rite digital flow meter measures a wide range of fluids, including most automotive fluids, mild acids and many industrial chemicals. 2 to 20 GPM Digital Meter. Accuracy of ±0.5%. Left to Right Flow. 1" NPT Threads. Can Measure in Gallons, Liters, Quarts, Pints, Ounces, and Special Units (Field Selectable). 20 Preset Calibration Points. For Use with Water and Chemicals. Not For Use with Liquids with a Flash Point of 100° F (37.8° C) or Less.