The E3RB-TP21 is a temperature controller manufactured by Omron. It is a microcomputer-based temperature controller with advanced digital communication and programmability, making it ideal for a variety of industrial applications. It has a heat/cool, single-stage control output, adjustable setpoint and digital control of a variety of input ranges. The E3RB-TP21 also has an intuitive LCD display, which allows users to easily configure settings and observe temperature values and alarm states quickly. Additionally, it has a built-in digital communication port, which enables remote communication with other devices, such as computers, PLCs, and HMIs.