Sharp EL-531W advanced D.A.L. Scientific Calculator with new LE44 batteries

This was my son’s (and he made straight A’s in Calculus and Science, so it must be good:). I installed 2 fresh LR44 batteries on 10/26/23. It works perfectly, but I don’t know the scientific calculation formulas, so I just pressed a few random keys in the video. Slide-on cover for keyboard. Scientific calculations insert included.