The Walston industrial flow meter is suitable for a wide range of applications. This flow meter is perfect for use on your auxiliary or transfer fuel tank, it is capable of metering diesel, gasoline, kerosine, coolants, hydraulic oils, motor oils, and mineral spirits Accurate within ±0.5% between 3-30 Gallons per minute of flow. The Walston Industrial flow meter is factory calibrated for fuel and can be easily recalibrated for any fluid meter application. The Meter is equipped with 3/4 inch female NPT threads at the inlet and outlet for convenient and tight sealing leak free installation Powered by 2 AAA batteries (included) The Walston Industrial meter display and rugged aluminum body thats provides strength and resilience for extreme duty industrial applications 4 units of measurement, gallon, quart, liter, and pint. Easily reset to your preferred unit. Walston Industrial has set a new standard for quality in every area in which we sell. Our relentless pursuit of perfection has brought us to the cutting edge of technology and brought you the highest quality products on the market. The Walston Industrial GH5630 digital flow meter is a turbine type meter with a cast aluminum body. Meter features digital display for convenience and variable unit selection. The GH5630 is powered by 2 AAA batteries that come included with the flow meter. The Walston Industrial GH5630 is intended for flow rates from 3-30 GPM (10-100 LPM).