CTI 15 2.5-4A is a proportional-integral-derivative (PID) temperature controller, manufactured by Danfoss. It features three adjustable control parameters, two alarms, manual/auto operation mode and a PID tuning assistant. It has built-in bidirectional communications, allowing remote monitoring and control, and is capable of connected to different external thermostatic probes, including Platinum RTDs and thermocouples. The device is easy to use and it supports different modes of operation, including auto-tuning and manual control.