Brief description: It is suitable for pre-treatment of various pipes, plates, and profiles for external impact resistance testing. It consists of a freezer and a control instrument; The controller consists of a digital temperature sensor, a temperature control circuit, an instantaneous power-off protection circuit, and an LED digital display panel. It has the characteristics of high control accuracy and easy operation. Execution standards: The product complies with the relevant provisions of GB/T14152-2001, GB/T1043, GB/T1843, GB/T8814, and GB/T15558.1 standards.