Product Description Glycol antifreeze freezing point: -50 ~ 0 , the division value of 1 Propylene glycol antifreeze freezing point: -50 ~ 0 , the division value of 1 Electrolyte specific gravity: 1.10-1.40, index value 0.01. (1.15 ~ 1.20 need to charge; 1.20 ~ 1.25 enough power; 1.25 ~ 1.30 enough power) Glass cleaning fluid freezing point. -40 +0 , division value of 5 Contain: 1 * Refractometer 1 * Screwdriver 1 * Manual 1 * Cleaning Cloth 1. USE: With this refractometer, the concentration of ethylene glycol and propylene glycol of the antifreeze in your car, solar system, heat pumps, the freezing point of the windshield washer fluid, the heating system or other machines or systems can be determined 2. MEASURING RANGE: Ethanediol (ethylene glycol): -500C to 0C; Propanediol (propylene glycol): -500 C to 0 C; Water Windshield - Ethanol + Water: -40C to 0C, Propylene Glycol + WaterSRF1): -40C to 0C. Urea Concentration 30%-35%, Battery Acid 1.10-1.40 kg/L. 3. TEMPERATURE COMPENSATION: Temperature compensation device included to ensure the measurement is easy and convenient to PRECISION MEASUREMENT: Adjust the optical system of the eyepiece group: 4-8 times the amplification system, continuous manual focusing. Can adapt to all eyes. 4. HIGH QUALITY: Our chrome-plated brass body is resistant to chemical corrosion and wear, the service life of the refractometer is increased several times compared to other aluminum housings. Note: The data is manual measurement, please allow an error of 1-35cm, due to the differences between the light and the screen, there will be a certain color difference, the specific received in kind prevail.