Great App.

I grew up with RPN calculators. Now since I have an iPhone I don’t have to carry the old HP 28C with me. This APP replaces it. As long as I am concerned it was worth to get the iPhone just for this. Thank you.
I read the reviews. I you are looking for a calculator application, please look up “RPN calculator” on Wikipedia before downloading and reviewing. Once you learned the RPN method you may realize its numerous advantages.

Patyilo about ND0 RPN Graphing Calculator