Review on 📊 DEF Refractometer: Accurate Measurement of Diesel Exhaust Fluid Concentration in Diesel Engines by Chelsea Hayes

Arrived the next day after ordering, well packaged. Already calibrated, tested with distilled water according to instructions and requires no adjustment. The device makes a robust and well-made impression. Tested 2.5 gallon BlueDef, bought same day, only a few months old and refractometer showed 32.5%, right to spec. Also tested a 2.5 gallon container bought in 2019 when towing a motorhome that Covid had not used in the past two years. He also showed 32.5%, so he used it to fill up a DEF tank on a truck. The cover is good, durable, with good cushioning. The instructions on the sleeve are clear and easy to follow.