4 in 1 Automotive Refractometer for Ethylene, Propylene, AdBlue and SRF1 This antifreeze refractometer can measure the freezing point of ethylene glycol or propylene glycol based antifreeze liquid. Use this anti-freeze hydrometer tester to test the specific gravity of battery acid, windshield wash fluid and adblue, which gives a quick reference to the condition of your car. Features: The antifreeze refractometer can measure automotive glass water, adblue, antifreeze and battery liquid. Automatic Temperature Compensation (ATC) to easily obtain measurement data. Antifreeze refractometer can adjust the eyepiece so that you can see the scale clear. Portable and handy car coolant antifreeze tester, easy to calibrate and use. Use only ambient light, which means there is no battery or power source needed. Measuring range: Freezing point of propylene glycol antifreeze 14.4°C to 32°F / -50°C Resolution: 1°C Ethylene glycol antifreeze freezing point: 30°F to 32°F / -50 to 0°C, resolution: 1°C. Automotive glass water freezing point: -40 to 0 °C. Resolution: 1°C Adblue concentration (urea): 30% ~ 35%, Resolution: 0.2%. Specific weight of rechargeable battery liquid: 1.10~1.4kg/l, resolution: 0.01 Specification: Material: Aluminum and ABS rubber. ATC Range: -10~30℃ Dimensions: 155 x 40 x 40 mm. Net Weight: 87g Package List: 1 x Antifreeze Refractometer 1 x Calibration Screwdriver 1 x 2 ml jar. 1 x Cleaning Cloth (Random Color) 1 x user manual (English language not guaranteed). 1 x user manual (English language not guaranteed). 1 x Plastic Box