The RKC Instrument REX-D400 is a digital temperature controller in the REX‑D400/900 family designed for precise process temperature control. Available variants such as D400W-M and DD-N-N indicate different power and option configurations, with a compact front panel measuring 96 × 48 mm and a body depth of 114 mm. It provides PID control with Auto-Tune and Heat/Cool modes, and there is a fuzzy-logic function option for certain configurations. Thermocouple inputs cover broad ranges, including configurations that read up to 1769 °C, enabling use in high-temperature applications like furnaces and industrial ovens.
