The A4AA Temperature controller design with with thermocouple-break indication, and has a selective ON / OFF or proportional switch. This device is set up with the type of analog setting, has a type of analog display. It can operate with an output of relay or voltage of 12VDC. This tool is also available with or without alarm. This device can work with setting accuracy of ± 0.5 % full scale, and has an indication accuracy of ± 0.5 % full scale.