These are factory certified replacement light displays for the Monroe 3190 printing calculator. If the display is dim in your Monroe 3190, chances are it's due to the display burning out. With this part, you can easily change out the display of your calculator and have it lit-up like new again. These are perfect for individual users who wish to repair their Monroe 3190 calculator, or any technicians servicing Monroe calculators who need extra parts. Limited supply available.