Graphing calculator used for saved/saving quantum, and algebraic calculations. I was going to use it as a back up for my old almost broken reverse polarity calculations tablet ($1.3k) but my other engineer buddy gave me his contact whose going to fix the "enter" button. So BEST OFFER gets this brand new one with portable/chargers included all included original packaging. +1. my name is Stopwatch and I can deliver it anywhere in the bay area.