Controller for low temperature Application Refrigerator, Freezer, Showcase, Vending machine, Hot Water heater Description Provides precise temperature control by regulating the power source of compressor. Features Temp. Range: - 30 - 20 Diff.: 2 - 10 Small size, light weight and easy manipulation.Operating temperature, length of capillary tube and mounting condition can arbitrarily be set to meet customers request. Certification UL, CSA, SEMKO, CQC