Dual-purpose tester for antifreeze freezing point and battery liquid density is an optical instrument designed according to the corresponding relationship between the concentration of the solution (corresponding to the freezing point) and refractive index. This instrument can quickly test the crystallization freezing point of ethylene glycol and propylene glycol type antifreeze, and measure the specific gravity (relative density) of battery water. It can also be used for car 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 based car cooling and aqueous car window cleaning solutions. It can also check the specific gravity and electrolyte usage status in the battery. The refractometer adopts high quality materials and metal body, so the body perfectly shows the metal material , and the touch surface has a good texture and a solid texture, the finished product has a firm structure and a long service life. Zero calibration: Calibrate with distilled water at 20C in 20C environment. This product is mainly used to measure the freezing point of glass water solution. Due to its reliable principle, accuracy to meet actual needs, small size, light weight and beautiful appearance, it is widely used in automotive industry. Urea: 30%35% EG antifreeze freezing point -50~0 (ethylene glycol) PG antifreeze freezing point -50~0 (propylene glycol) Chemical cleaning agent - 40~0 Shipping Quantity: 1 piece