Labtron Freezing Point Tester determines freezing points within -54 °C to 2 °C, with temperature control accuracy of ±0.5 °C. The refrigeration compressor cools the stainless-steel bath, while automatic endpoint judgment identifies the freezing point. A double-vacuum glass observation window allows sample observation during testing. Manufactured for low-temperature fuel and coolant analysis, this digital freezing point analyzer serves petroleum testing laboratories.