1.temperature range: -40 ~ 30/ -60 ~ -20 degree 2.alarm device 3.closed loop system 4.LED display FEATURES :1. Multi-safety protection, more reliable operation; 2. Brand compressor, cascade refrigeration cooling technologies; 3. Computer-cascade temperature controller, PT100 temperature sensor, 4. Can set temperature difference when compressor is open and off ; 5. Monitoring the ambient ...