The Microprocessor PID is a controller with auto-tuning capabilities and digital display. it features two circulation fans that provide and maintain good temperature uniformity. Overheating is prevented thanks to an over-temperature protection circuit. The design of the controller features a see-through acrylic lid and lamp. This enables the user to observe specimen in the chamber without affecting the specimen inside. Whenever the lid is opened, the system automatically stops shaking, and then starts up again whenever the lid is closed.