Features: 1.With a clear measuring scale, and it is easy to focus and calibrate during the measurement process, and the measurement value can be read directly. 2.Equipped with a 4?in?1 scale, and with it you can be aware of the comprehensive information clearly, which is convenient. 3.With aluminum alloy structure and soft and comfortable non?slip pad, making it lightweight and durable 4.Compared with other refractive agents made of inferior materials, our antifreeze refractometer is non?corrosive, non?reactive aluminum alloy, portable and scratch resistant. 5.With compact shape, lightweight and portable, take up no space and you can put it anywhere. Specification: Condition: 100% Brand New Item Type: Automotive Antifreeze Refractometers Material: Aluminium Alloy Measuring Range of Freezing Point of Glycol Coolant: -50-0 Measuring Range of Freezing Point of Propanediol Coolant: -50-0 Battery Fluid: 1.100-1.400sg Resolution Factor: 5C(10F), 5C(10F), 0.01sg. ATC (Automatic temperature compensation) Compensation Range: 10C-30C (50F-86F), 10C-30C (50F-86F) PackageList: 1 x Antifreeze Refractometers 1 x Dropper 1 x Screwdriver 1 x Manual 1 x Toolbox