When a liquid sample is placed on the prism, the light passing through it is bent. The more concentrated the liquid, the more the light will bend.
Doc’s Diesel DEF Guard Diesel Exhaust Fluid Additive
OTC 3674 DIESEL FUEL PRESSURE TESTER MEASURES 0-1,500 BAR 12 Volt DC
NuDef Diesel Exhaust Fluid Additive Cleaner Prevents Crystals & Freezing 6 Pack
Piusi F00407340 K-24 Digital Electronic Flow Meter for DEF Diesel Exhaust Fluid
Blue DEF DEF001 Diesel Exhaust Fluid - 55 Gallon Drum
