PERFORMANCE TOOL PROFESSIONAL DEF TESTER

The Performance Tool W16500 DEF Tester uses a refractometer design to check the concentration of urea in your Diesel Exhaust Fluid (DEF). This is important because DEF that isn't the correct concentration can cause your vehicle's Selective Catalytic Reduction (SCR) system to malfunction, potentially leading to reduced engine power or even a no-start condition.

This tester is designed for straightforward use. You simply place a small sample of DEF onto the prism, close the cover, and look through the eyepiece. The tester will show a clear line indicating the concentration, allowing you to quickly determine if your DEF is still good or if it needs to be replaced. It's a well-built tool that helps you avoid costly SCR system repairs by ensuring you're using quality fluid.

Keeping your DEF at the proper concentration is key to maintaining the health of your diesel's emissions system. This tester is a practical addition to any diesel owner's toolkit for routine checks.