Engineered polymer in-line turbine meter that may be installed at the end of a hose or plumbed in a fixed pipe installation with the 1" NPT inlet/outlet. Great for DEF, agriculture chemicals, non-potable water, and many other chemical applications. The meter comes from the factory with 20 pre-set calibration factors based on fluid type or can be easily calibrated in the field. Operates on 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