... can ensure high reliability and anti-disturbance capability Optional relay for alarm or ON/OFF control Wide working temperature rangeFast ... temperature calibration, transmitter zero/range setting, transmitter range setting, relay setting, etc.Specifications SensorDigital temperature sensorRange0~50°C, or ... environment ambient guide GB/T4200 and WBGT etc, the relay default settings are ON-30.0°C/OFF-29 ...