Digital Diesel Exhaust Fluid (DEF) Refractometer Tester

Digital Diesel Exhaust Fluid (DEF) Refractometer Tester

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The Diesel Laptops Digital DEF Refractometer is the ideal tool for testing Diesel Exhaust Fluid (DEF) quality. Diesel Exhaust Fluid is used in every commercial truck since 2010, and all off highway diesel engines had to meet Tier IV guidelines in 2014. This means there are literally millions of diesel engines in use every day that require DEF to operate properly.

The Diesel Laptops Digital DEF Refractometer is the ideal method for testing your DEF quality. Simply place a few drops of DEF in the stainless steel testing area, press the button, and you will have your results in seconds on an easy to read display. You can easily take multiple readings to ensure you have the most accurate results possible.


  • Digital Readout - Remove the possability of human error when reading sight glass measurements from non-digital models. Sight glass refractometer readings can also be greatly effected by poor lighting condition and technician viewing angles. These problems go away with a digital model.
  • Automatic Temperature Compensation - With traditional, manual DEF refractometers the temperature of the surrounding air can influence the readings, and if not taken into account will give inaccurate results. This digital refractometer includes a sensor to read ambient air temperature and calibrates itself accordingly.

Kit Components

  • Easy to carry case
  • Digital DEF Refractometer
  • Batteries
  • Eye Dropper

Other Information

This tool comes with a 12-month warranty.