Optical instrument for checking AdBlue, Def, Coolant and washer fluid freezing point as well as the battery's state of charge. Shows the freezing point of both AdBlue, ethylene glycol, propylene glycol and washer fluid with three different scales showing in °C, as well as a scale for the specific gravity of the acid. The antifreeze and the specific weight of the acid are marked with a sharp light/dark line on the scale. The check of the specific gravity or freezing point takes only a few moments regardless of the temperature of the liquid, only a few drops are needed to make the test. The MT-415 comes with a custom box and suction pipette. Can also be called adbluetester, glycol tester.