Relay with 100~240V Power, Suitable for Greenhouse, Aquarium, Reptile Incubator, Terrarium, Growing Room, and Beer Brewing. High Low Alarm]The temperature controller is equipped with High or Low Temperature Alarm and Sensor Error; Temperature Calibration. 2M IP68 NTC Probe] Terrarium Thermostat with Compressor Delay Protection; Waterproof NTC Probe (IP68 Level) in Stainless Steel. Quick Guide]Heating Cooling Thermostat for Solar Pool Heating with 2 EU Plugs; Heating and Cooling Switching; Easy to Install; TS is the target temperature, HD is the heating difference value, CD is the cooling difference value; When the measured temperature is higher than TS+CD, turn on the chiller to TS; When it is lower than TS-HD, turn on the heater until it reaches TS.