Antifreeze freezing point detector methanol refractometer battery water density tester portable refractometer The dual-purpose tester for antifreeze freezing point and battery fluid density is an optical instrument designed based on the corresponding relationship between solution concentration (corresponding freezing point) and refractive index. This instrument can quickly test the crystal freezing point of ethylene glycol and propylene glycol antifreeze, measure the specific gravity (relative density) of battery water, and can also be used for automotive cooling water, coolant antifreeze, etc. The antifreeze freezing point detection refractometer is used to measure the freezing point temperature of cooling systems, ethylene glycol and propylene glycol type automotive coolants, and water-based window cleaning fluids. It can also check the specific gravity in the battery and the use of the electrolyte. The refractometer is made of high-quality materials and a metal body. The body perfectly displays the metal material, the touch surface has a good texture, a solid texture, a firm finished product structure, and a long service life. Zero point calibration: calibrate with 20C distilled water in a 20C environment. This product is mainly used to measure the freezing point of glass water solution. It is widely used in the automotive industry because of its reliable principle, accuracy that meets actual needs, small size, light weight and beautiful appearance. Urea: 30%35% EG antifreeze freezing point -50~0 (ethylene glycol) PG antifreeze freezing point -50~0 (propylene glycol) Chemical cleaning agent -40~0 Quantity shipped: 1 piece