The thermocouple is located within the 1/2" thick hot plate surface. Includes digital type controls. operating in °F or °C is available. The units are completely tested for "PLUG AND PLAY" operation. Option: the unit is available with a manual reset function to prevent over heating above the prespecified value. The unit will turn off under these condtions and will restart when the operator activates the instrument reset. Critical operations require the settings to be all locked out to prevent unauthorized operator adjustment.