Product Description Description This device measures the proportion of antifreeze and freezing of glass cleaner, lead-acid battery electrolyte. It has a refractometer with automatic temperature compensation to give you the most accurate measurement in any type of environment temperature. Features - Size: 15.5 * 4cm. - Measures the proportion of antifreeze and freezing of glass cleaner, lead-acid battery electrolyte. - Automatically adjust itself to correct temperature discrepancies during use. - Capable of measuring with high accuracy and provides precise results. - Equipped with vivid and sharp reticle chart for easy and comfortable reading. - It uses ambient light only and no batteries are needed. Package Including 1 * Car Auto Antifreeze Glycol Battery Refractometer Tester (Silver+Black) 1 * Screwdriver 1 * Sucker 1 * Manual