Glycol antifreeze freezing point: -50 ~ 0 , the division value of 1 Freezing point of the propylene glycol antifreeze: -50 ~ 0 , the division value of 1 Specific weight 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) Glass cleaning fluid freezing point. -40 +0 , division value of 5 Contain: 1 * refractometer 1 * screwdriver 1 * manual 1 * cleaning cloth 1.APPLICATION: This refractometer can be used to determine the concentration of ethylene glycol and propylene glycol in the antifreeze of your car, solar system, heat pump, the freezing point of windscreen washer fluid, heating system or other machinery or equipment 2.MEASUREMENT RANGE: ethanediol (ethylene glycol): -500C to 0C; Propanediol (propylene glycol): -500C to 0C; Washer fluid - ethanol + water: -40 C to 0 C , propylene glycol + waterSRF1): -40 C to 0 C . Urea concentration 30% - 35%, battery acid from 1.10 to 1.40kg/L. 3.TEMPERATURE COMPENSATION: Included temperature compensation device to ensure the measurement is simple and convenient toPRECISION MEASUREMENT: Adjust the Eyepiece group optical system on: 4-8 times the amplification system, stepless manual focus. Can adapt to all eyes. 4.HIGH QUALITY: Our chrome-plated brass body is resistant to chemical corrosion and wear-resistant, the service life of the refractometer is increased several times than other aluminum body.