- Professional optical refractometer for measuring the freezing point of antifreeze and the condition of battery acid - Compatible with ethylene glycol, propylene glycol, windshield washer fluids (ethanol/isopropyl), and AdBlue - Automatic temperature compensation (ATC) from 0 to 30 °C for maximum accuracy in any environment - Visual sharpness adjustment on the eyepiece for clear and precise readings - Measurement range: ethylene glycol/propylene glycol 0-50 °C, battery acid 1.10-1.30 g/ml, AdBlue 30-35% - Universal scale for easy interpretation of multiple automotive fluids - Includes rigid plastic case, cleaning cloth, suction tube, screwdriver, and manual - Essential tool for workshops, mechanics, and users seeking quick and reliable car fluid diagnostics