Temperature control function: Real-time temperature range: -40-120C2.1 Open circuit (or below -45C) The first line of the screen flashes and displays "E1", -40- 45C displays -40C. 2.2 Short circuit (or above 120C) The first row of the screen flashes and displays "E2", 121-129C displays 120C.Heating mode, when the set start temperature is lower than the stop temperature for heating mode, the corresponding icon is displayedWide Application: Experience the adaptability of the temperature controller plug in various settings. This thermostat is widely used in temperature control systems such as greenhouses, constant temperature reptiles, dimming constant temperature reptile incubators, glass containers, freezers, refrigerators, heaters, aquaculture, home brewing, etc. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.