Digital Oil Meter Dial/Digit Totals 99999.9 Units Dial Graduation 0.001 Units 0.30 to 8 gpm GPM Operating Pressure (PSI) 1 000 psi Inlet (In.) 1/2 in FNPT Outlet (In.) 1/2 in NPT(H) For Use With Biodiesel Diesel Oils with viscosity up to 5000 cst Includes Digital Register Oval Gear Mechanism Rubber Shroud on Meter two 1.5V batteries