RTS-series cooling thermostat is precision-controlled test equipment with feature of good temperature stability, temperature field uniformity and high accuracy. It uses imported closed compressor cascade refrigeration system. The temperature controller achieves temperature control according to the PID regulating. It is compact structure and easy to operate it. It is suitable to test physical parameters in biochemical, petrochemical, meteorology, energy, environmental protection, medicine and production of thermometers. It also provides constant source for other test and research.