u The equipment is using a folding compressor cooling, using thermal balance principle and cyclic stirring, to reach the automatic uniform cooling and constant temperature of the sample, the equipment is simple and easy to operate, the work efficiency is high, using a single chip machine technology control, digital temperature value, automatic temperature control, automatic recording time, automatic alarm, operation is simple and safe, the cooling speed is fast, the volume is large, the temperature control precision is the ideal sample cooling equipment in the material low temperature impact test.