ITEM NAME:90V-250V Temperature Controller Digital Temp Thermostat Control Relay W/ Sensor.Turn on your device at a degree and turn it off at another. your need. Long Sensor Cable: 1m/39in. Size of the waterproof probe head(about): 4.2 20 mm/0.17 0.79 in. and low temperature shocks, with small drift and more stable performance.