Product Description Freezing point of glycol antifreeze: -50~0, the division value of 1 Freezing point of propylene glycol antifreeze: -50~0, the division value of 1 Weight specific of the electrolyte: 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) Freezing point of glass cleaning fluid. -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, freezing point of windshield washer fluid, heating system or other machines or systems can be determined 2. MEASUREMENT RANGE: ethanediol (ethylene glycol): -500C to 0C; Propanediol (propylene glycol): -500C to 0C; Windshield water - ethanol + water: -40C to 0C, propylene glycol + waterSRF1): -40C to 0C. Urea concentration 30% - 35%, battery acid 1 .10 to 1.40 kg/L. 3.TEMPERATURE COMPENSATION device: Temperature compensation device included to ensure the measurement is easy and convenient to PRECISION MEASUREMENT: Adjust the eye group optical system: 4-8 times the amplification system, focus manual stitch continuously. Can fit all eyes. 4.HIGH QUALITY: Our chrome-plated brass body is resistant to chemical corrosion and wear, the lifespan of the refractometer is increased several times compared to other aluminum housings. Note: The data is manual measurement, please allow 1-35cm error, due to differences between light and screen, there will be a certain color difference, the specific received in kind shall prevail.