TheSRT-HSPSW is an adjustable wall mount room temperature sensor WITH A SWITCH .  The setpoint knob can be configured for exposed or concealed temperature adjustment.  It is suitable for use with all the analogue HTC series temperature controllers. Constructed from high impact ABS plastic, the housing is specifically designed with sensor sensitivity in mind making theSRT-HSPSW very responsive even in low airflow situations. the switch rating should not exceed 24vac 15mA.