AdBlue/Diesel Exhaust Fluid (DEF)/ Urea Preset Flow Meter can allow to Dispense Urea/D.E.F/AdBlue with Preset like Sale, Liter, Price. Have 0.2% Accuracy. A flow meter is a device that measures how much liquid moves through a pipeline in a given period of time. By measuring flow rates, flow meters provide crucial visibility into what's flowing where, within pipes, drainage systems, and other types of infrastructure