This is an OMRON calculator, likely from the 1970s. It features green illuminated numbers and a unique design (resembling a measuring instrument), which is not typical for a calculator. It operates on two AA batteries. The case of this item has been lightly cleaned, and the buttons and display have been confirmed to function with basic calculations. The main body has minor scratches and dirt. Please check the photos for the exterior condition. *The ruler in the photos is not included. *Batteries and instructions are not included.