Fill-Rite 820

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 Petroleum Based Liquids. Not For Use wilth Liquids with a Flash Point of 100 F (37.8 C) or Less.