The GPI Digital diesel exhaust fluid meters are suitable for inline or end-of-hose installation for use with DEF, water, or similar fluids. These electronic flowmeters are virtually maintenance-free and provide continuous measurement, flow range of 3 to 30 GPM (10-100 L/min). This meter meets ISO 22241-2 Annex C, D, E, F, G, H, I, Diesel Exhaust Fluid (DEF)/Adblue standards.