The Alphanumeric Display is a programmable microcontroller based message or banner displaying instrument, which can be used for identification of Panels or Racks or for general indication purposes. It also alternates the internal temperature of the panel on the same display. The instrument has an 18-character red LED alphanumeric display, which can be programmed with any standard PC Keyboard to read alphabets (A–Z), numerals (0–9) and some special characters such as *, +, –, etc. Simultaneously, a built-in temperature sensor monitors the temperature of the exhaust air within the panel and indicates it at regular intervals. The Display has a non-volatile memory – hence, on power failure, the last programmed message remains in memory and will be displayed on power resumption.