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Material: Constructed with Aluminum alloy for high corrosion and wear resistance. Versatile Testing: Accurately measures ethylene glycol, propylene glycol, urea, and battery acid. Measurement range: antifreeze -50~0℃, battery liquid specific gravity 1.10~1.40, windshield water -40~0℃, automotive urea concentration 30~35%. Calibrations: At first, take one or two drops of distilled water or pure water and drop them on the surface of the prism, and cover the cover; then adjust the calibration button until the blue and white boundary line coincides with the 0℃ baseline line. Wide Application: Ideal for car antifreeze, heat pumps and windscreen washer water.