The antifreeze refractometer can be used to measure the freezing point of glycol, antifreeze, coolant and battery acid. It can also be used to check the condition of batteries with an electrolyte solution. Features: Design portable and non-slip rubber grip for easy handling. Built-in Automatic Temperature Compensation (ATC) for faster results. With plane metering for direct reading. Adjustable manual focus, easy to focus and calibrate. Comes with a case, convenient for storage and portable use. Freezing point measurement of automotive antifreeze based on ethylene glycol or of propylene glycol. Scale Range: Ethylene Glycol Based: 32 to -84 degrees F, Propylene Glycol Based: 32 to -60 degrees F. Features: Color: Black Silver Blue Material: ABS Measurement range: Ethylene Glycol: -84~32C Propylene Glycol : -60~32 C Battery fluids: 1.10-1.40 kg/L Size of the item: shown as the picture Package size: about 20.5 x 7.5 x 5.5 cm / 8.1 * 3 x 2 .2 inch Package weight: about 250g / 8.82oz Package list: 1 * Antifreeze Refractometer 1 * Flat screwdriver 1 * Cloth cleaning 1 * straw 1 * User manual