SELEC TC 513AX Temperature Controller is an advanced auto-tuning PID controller or on/off controller with a selectable thermocouple, RTD up to two outputs. Forms are accessible with various hand-off and SSR output. The controller can be arranged as on/off or PID control and caution yields, or as 2 on/off or PID controls (warm/cool) in addition to 1 alert yield. It has a huge double 3 digits LED show to demonstrate the set point and the procedure esteem and is reasonable for use with power supplies of 85 to 270 VAC