Temperature controllers are devices used in industrial and commercial applications to precisely regulate temperature and maintain desired temperatures in various processes and systems. These controllers continuously monitor the climate using temperature sensors and compare it to the setpoint value. Based on the comparison, temperature controllers activate or deactivate heating or cooling devices to achieve and sustain the desired temperature. They play a critical role in applications such as HVAC systems, ovens, refrigeration units, and chemical processing. PID temperature controllers can offer features like control algorithms, programmable setpoints, alarm functions, and communication interfaces for integration with automation systems. SIGMA Surplus’s inventory has Watlow temperature controllers, Ogden temperature controllers, Honeywell temperature controllers, and several others available from premier manufacturers.