"JJF 1564-2016 Specification for calibrating Humidity TEUs" is applicable to the Measurement calibrating of Humidity TEUs with Temperature range from 5 ° C to 50 ° C and Humidity range from 10% RH to 90% RH. This specification refers to relevant national standards such as mechanical Thermohygrometer and electric ventilated wet and dry meter to ensure the accuracy and Reliability of the calibrating process. Humidity TEUs produce a stable and uniform temperature Humidity environment in their effective working area by adjusting the temperature Humidity setting value, which is used for calibrating and verification of mechanical pointer Thermohygrometers, temperature Humidity recorders and various temperature Humidity Sensors. The TEUs can adopt the dual temperature method or the Conditioning method, and realize the precise control and Stability of Temperature Humidity through different working principles to meet the measurement needs under various environment conditions.