Ethylene Glycol: -50C-0C (0--70% )Propylene Glycol : -50C-0C(0--70%)Resolution Factor: 5C, 5%,(ATC) Temperature Compensation Range: 10C-30CField of View Intermediate scale: (ETHYLENE GLYCOL) Ethylene glycol antifreeze freezing point.(PROPYLENE GLYCOL) Propylene glycol type antifreeze freezing point.Left scale: (BATTERY FLUID) Battery liquid specific gravity.1.15 ~ 1.20 to be charged1.20 ~ 1.25 power enough1.25 ~ 1.30 sufficient powerRight scale: glass cleaning solution freezing pointFirst, the principle:The instrument can measure the antifreeze and glass cleaning agent freezing point, the proportion of lead-acid battery electrolyte. Temperature compensation device is included to ensure the measurement is simple and convenient, to ensure accurate measurement in the 10oC ~ 30oC ambient temperature.The basic principle is to use the total reflection critical angle method to measure the refractive index of the solution, and then calibrate the measured liquid concentration and its performance. Because of its principle of reliable, accurate to meet the actual needs, there are small size, light weight, handsome in appearance, easy to use, it is widely used in the automotive industry.1, not in the relative humidity of more than 85% of the ring mirror in the long-term placement, so as not to affect the optical system.2, do not get into the liquid and water adjustment knob and eyepiece, so as not to damage the internal components.3, do not leap and collision, so as not to damage the instrument accuracy.4, immediately after use with a clean cloth to the prism and the refractive plate wipe light net.1)1 x Refractometer2) 1 x pipette3)1x instruction manual4)1x mini screw driver5)1x cleaning cloth Product Notes: Please allow a little manual errors.Due to the lighting of the photos and the difference of monitors, the pictures may not reflect the actual color of the real item. Please confirm acceptance before ordering. About Shipping: Please ensure your shipping informations are correct to avoid delivery issues. All orders are shipped within 3 days after payment. Delivery usually takes 8–12 days, The specific delivery time is depend on circumstances. If you have any questions during your purchase, feel free to contact us. We will respond you within 27 hours.