Universal electronic thermostat with digital display of the switch-on & switch-off temperature as well as the current temperature. The thermostat can be used in almost all situations that require temperature control in heating or refrigerating systems. Apart from being used as a st&-alone device, the Universal-Thermostat 100 can also serve as a replacement for faulty mechanical thermostats. A refrigerator with a faulty thermostat, for instance, can be switched on & off via the UT 100 built into the plug or socket housing.