Professional Diesel Exhaust Fluid Tester Maintain Urea Content at 32.5 percent Temperature Compensating JEGS Professional Diesel Exhaust Fluid Tester Features: Professional disc type DEF (Diesel Exhaust Fluid) tester For most diesel power cars  light duty and semi-trucks from 2010 to current Made to test the urea purity to maintained 32.5 percent Floating discs will accurately display urea levels Tests accurately hot or cold  temperature compensating

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