ARCalc PRO is my all-round calculator pro version.
You just input the formula and ARCalc PRO will do all the next for you.
Remember, ARCalc PRO can also check the formula for you when you press the equal button, and even point out the error index exactly where the error is.
As Pro version, we improve the interface, we have bigger display, bigger button, longer expression display. And even a brand new landscape view for more sophisticate expression calculation.
Just a little try, you will love it !