Digital UL Meter, Electronic In Line Turbine Meter, May Be Installed At The End Of A Hose Or Plumbed In A Fixed Pipe Installation With The 1" NPT Inlet/Outlet, Use For Gasoline, Diesel, Or Kerosene, 20 Pre-Set Calibration Factors Based On Fluid Type Or Can Be Easily Calibrated In The Field, Use 2 "AA" Batteries That Can Be Easily Changed When Needed, A Low Battery Level Alert Will Notify The User When It Is Time To Change The Batteries.