4 in 1 automobile refractometer for measuring ethylene, propylene, adblue and SRF1 This Antifreeze Refractometer can measure the freezing point of antifreeze fluid based on ethylene glycol or propylene glycol. Using this Antifreeze hydrometer tester for testing specific gravity of battery acid, windshield wash fluid and Adblue, which can provide a quick reference of your car condition. Features: The antifreeze refractometer can measure the automobile glass water, Adblue, Antifreeze and battery liquid. Automatic temperature compensation (ATC) easy to get the measurement data. Antifreeze refractometer can adjustable visual eyepiece to let you see the clearly scale Portable and handheld antifreeze car coolant tester is easy to calibration and easy to use Use ambient light only which means battery or power source is not required Measuring range: Freezing point of Antifreeze based on Propylene Glycol: 58? to 32?/-50 to 0 ?, Resolution: 1? Freezing point of Antifreeze based on Ethylene Glycol: 58? to 32?/-50 to 0 ?, Resolution: 1? Freezing point of Automotive glass water: -40? to 32?/-40 to 0 ?, Resolution: 1? Concentration of Adblue (Urea): 30%~35%, Resolution: 0.2% Specific Gravity of Rechargeable Battery Fluid: 1.10~1.40KG/L, Resolution: 0.01 Specifications: Material: aluminum and ABS rubeer ATC range: -10~30 ? (50~86 ?) Dimension: 6.1 x 1.57 x 1.57”/ 155x40x40mm Net Weight: 87g Package included: 1 x Antifreeze Refractometer 1 x Calibration screwdriver 1 x 3ml Pipette 1 x cleaning cloth(random color) 1 x Instruction manual 1 x Plastic box