4-in-1 antifreeze refractometer for checking the freezing point of automotive antifreeze systems, battery acid refractometer, ethylene-propylene glycol

【4 in 1】If you notice that your car battery, solar power system, or heat pump battery is no longer holding a charge, don't rush to replace it. With this antifreeze refractometer, you can measure your battery's acid density and get a quick overview of the battery fluid's condition. The refractometer can also be used to measure the freezing point of cleaning fluids, the antifreeze point, and the AdBlue point. Easy to use: Apply 2 to 3 drops of the sample to the refractometer prism and look through the eyepiece for a direct reading. ATC design: The refractometer features automatic temperature compensation from 10°C to 30°C, providing a direct, fast, accurate, and lightweight reading. Package contents: 1 x refractometer, 1 x calibration screwdriver, 1 x pipette, 1 x instruction manual, 1 x cleaning cloth, and a FREE hard case are included for convenient storage and transport. Note: Do not measure abrasive or corrosive chemicals with this instrument.