JJF 2019-2022 "Specification for Temperature performance testing of liquid thermostatic test equipment" applies to the temperature performance testing of liquid thermostatic test equipment with a Temperature range of -80 ° C to 300 ° C, and can also be applied to the testing of similar equipment. This specification refers to a number of key documents, including methods for inspection of environmental test equipment for electrical and electronic products, standards for Thermostatic baths and thermostatic cycling devices. The terminology section defines key concepts such as workspace, temperature deviation, Temperature uniformity and Temperature stability. Liquid thermostatic test equipment is usually composed of a tank body, a heating or cooling device and a temperature control system. It maintains the working medium at a set temperature through a control circuit and is suitable for precise temperature control in various laboratory and industrial environments.