DEF-CHEK Professional Tester

• Test Urea Concentrate of Diesel Exhaust Fluid
• If mixture is 0.7% off, mfg suggest replacing the DEF and identifying the problem
• Temperature compensating discs test DEF hot or cold
• Tester is a cost effective tool to test DEF
• IF DEF is not tested, it will cause harm to the vehicle

If the DEF concentrate is not correct, injectors may become clogged and the DEF will not work properly.