[High Current 30A Relay]: High power: 220V 30A. It is can be used high power equipment, like refrigerator,brooder,incubator,Fermenter, Greenhouse,etc. Connect power supply and heating/cooling equipment, place the probe and set the temperature, it work great. [Simple to Use]:The temperature range for this temperature controller is -40-110℃. Convenient to set and adjust, with HD LCD display and 4 buttons. It is a relay temperature controller, you need to connect additional power supply for the load. [Heating/Cooling Function]: Heating Mode 'H' : when the detection temperature less than equal set temperature - hysteresis temperature, the relay is turned on, and the heating equipment starts to work; When the detected temperature equal the set temperature, the relay is disconnected and the heating equipment stops working. The principle of Cooling Mode 'C' is the same. [Delay &Temperature Correction Function]: Delay 'OPH': When a heating or cooling job is completed, the system starts timing 'T'. When T equal OPH, the system can perform round of heating or cooling work. Temperature Correction 'OFE'(-10.0-10.0℃): When the system works for a long time, there may be deviations, which can be corrected by this function. Actual temperature = measured temperature + calibration value. [High Temperature Alarm Function]: When the actual temperature equal the alarm temperature, the system turn on the sound and light alarm and disconnect the relay, press any button to stop the sound and light.