Connect the heater and cooler at the same timeNo need to frequently change the wiring between heater and cooler. This temperature controller with sensor has 2 relays. Compared with other 1 relay temperature controllers, you can wire 2 appliances (heating and cooling) at the same time. Please note that there are no sockets, wiring required. Keep the temperature within the desired rangeThis is the on/off control mode. Control the temperature by adjusting the temperature setting and difference, the heating and cooling mode can be automatically switched on. Make full use of STC microcontroller and NTC probe to make this temperature controller have high accuracy. High PrecisionMade of sturdy ABS plastic shell and flame retardant with built-in structure, this digital dual relay thermostat is safe and energy saving. Power consumption: ≤3W, Temperature control range: -50~99, Accuracy: ±1, Power Supply: 230Vac 50Hz/60Hz, Output: 2 Relays, Cool/Heat (10A/250Vac). MultifunctionalThis incubator thermostat supports temperature calibration, compressor delay protection, alarm when temperature exceeds temperature limit or sensor error, all settings of parameters can be saved after restart. 2m Waterproof ProbeThis 230V digital temperature controller can be used in humid and aquatic environment. Such as aquarium, seafood machine, aquaculture, hatchery, terrarium, vivarium, seedling heating mat, incubator, brewing, freezer, water tanks, refrigerator, industrial cooler, fermentation, industrial equipment, etc.