Review on 🔬 Enhanced OTC 5025 Diesel Exhaust Fluid (DEF) Refractometer by Jayme Newitt

This just WORKS and works well. Thanks to another reviewer who downgraded another refractometer for the Celsius-only temperature scale. Hey, here in the US we're sending a rover to Mars and we still speak Fahrenheit here. There's a message somewhere. After receiving it, I only took it for a test drive. The test report is as follows: A small bottle of deionized water was included in the accessory kit and with that I quickly found that the factory calibration right out of the box was accurate. Excellent work! During the calibration check, I also found the optics to be clean, with a diopter that is easy to adjust. In addition, the included manual is clearly written in easy-to-understand English (no Chinese). They are also provided in several other languages, which is why we have bins. ;) The final test was to see what condition the DEF was in in our diesel RV. Luckily it passed which made me a happy backpacker as it sat idle for a year while the country was shut down due to "COVID”.