These calculators were used in a school environment.  See images for example of the type of calculator you may receive. 

Grade D is determined by the front of the calculator only not the back.  I look for the printing on the keys that have completely missing markings across most of the keys.  The screen may be splotched as seen in the images.  They may not be as severe as the one in the image but this is an example of one that you may receive.  May contain heavy scratches on screen. 

Calculator was tested for functionality.

The calculator requires 4 AAA batteries, which are not included.

Thank you for your time looking at my listing.