RHA-503ATC Portable Automatic Car Battery Antifreeze Fluids Refractometer Glycol TesterFeatures:* The refractometer is designed according to the principle of different concentration of liquid having different refractive index.* Specially designed to apply for automatic cars/vehicles battery antifreeze fluids glycol testing and analyzing.* Allows easy steps for quick and accurate testing/analyzing the glycol concentration of engine coolants or other anti-freeze solutions.* Equipped with ATC (Automatic Temperature Compensation)， can automatically adjust itself to correct temperature discrepancies while being used.* You may easily know the freezing point for both propylene glycol and ethylene glycol， with the indication of the percentage.* It is also used for checking the strength of electrolyte solution batteries.* Decorated with soft and comfortable anti-slip rubber.* Small size and light weight， makes it a portable one， very convenient.* The best partner for the car-owners in winter.Package Included:1 x Antifreeze Fluids Refractometer1 x Mini-screw Driver1 x Pipette1 x Cleaning Cloth1 x Carrying Case