The Brilliant Tools Refractometer BT536010 allows you to determine the concentration of ethylene glycol and propylene glycol in the antifreeze of your car, solar system, or heat pumps. It can also measure the freezing point of windshield washer fluid or the concentration of urea in AdBlue. The refractometer offers a high level of precision and user comfort with its integrated automatic temperature compensation system. The device features a sturdy metal housing and a plastic-coated handle. It includes an optical tester with various functions: testing battery acid density, checking antifreeze effectiveness in coolant (divided into ethylene and propylene), testing antifreeze effectiveness in ethanol- and alcohol-based windshield washer fluid, as well as urea testing for AdBlue (AUS32). The eyepiece is adjustable, and the measurement accuracy is +/- 5%.