The commercial steam temperature alert is a must-have for safety. The lock feature prevents users from turning off the system or changing the temperature setpoint. The interrupt relay disables the heater when the audible alarm sounds and the test button is used to check that the heater is disabled when the alert sounds. The alert cannot be reset until the room cools below the programmed temperature. Lock feature prevents users from turning off the system or changing the temperature setpoint The alert cannot be reset until the room cools below the programmed temperature Interrupt relay disables heater when the audible alarm sounds Test button is used to check that the heater is disabled when alert sounds US Customer Support and Service Digital Display with Audible Alert Heater Interrupt Relay and Test Button Prop 65 Warning: DEHP Phthalate