It is so hard to know what exact calculator the high school teachers want. I lucked out and one major points and getting this one. My daughter said it was the exact one she needed for high school geometry. There's also a great price on this calculator as it seems to be much less than some of the other ones with more letters and numbers behind its name. Even better, I was able to get it same day with the qualifying order. That makes it much easier than running out to the stores looking for one. The calculator itself is nice and sturdy and has a slide on, slide off protector or cover. This cover also has some directions inside of it for solving different calculations. Overall the perfect buy!