Only iPad calculator worth using

Tried a bunch of iPhone calculators for science this is the one I tell my students to get. Does all you would want in a scientific calculator with keys large enough to actually use. Not tried graphing with it but I am sure it works fine. My only complaint is that it is hard to find on store and I am always forgetting the publishers name when recommending it.

Edmer odin about Calculator +, v2.2.6