1. Product Details: - Freezing point of ethylene glycol antifreeze: -50 to 0°C, with a graduation value of 1°C. - Freezing point of propylene glycol antifreeze: -50 to 0°C, with a graduation value of 1°C. - Specific gravity of electrolyte: 1.10 - 1.40, with a graduation value of 0.01. (Recharge is needed when it is between 1.15 - 1.20; the battery has enough power when it is between 1.20 - 1.25; the battery also has enough power when it is between 1.25 - 1.30). - Freezing point of windshield washer fluid: -40 to 0°C, with a graduation value of 5°C. 2. Contents Included: - 1 refractometer - 1 screwdriver - 1 instruction manual - 1 cleaning cloth 3. Uses: - This refractometer can be used to measure the concentration of ethylene glycol and propylene glycol in antifreeze in automobiles, solar panels, heat pumps, washer fluid freezing points, heating systems, or other machines or systems. 4. Measurement Range: - Ethylene glycol: -50°C to 0°C; - Propylene glycol: -50°C to 0°C; - Windshield washer fluid (ethanol + water): -40°C to 0°C; (propylene glycol + water SRF1): -40°C to 0°C. - Urea concentration: 30% - 35%. - Battery acid: 1.10 to 1.40 kg/L. 5. Temperature Compensation: - It comes with a temperature - compensation device to ensure easy and comfortable measurement. It can adapt to all eye shapes. 6. High - Quality: - Our chrome - plated brass body is chemically resistant and durable. The service life of the refractometer is several times longer than that of other aluminum bodies.