e-calcPro app for iPhone and iPad

This calculator can be used not only in scientific notation(e.g. 1E-6) but also using engineering multipliers(e.g. p,n,u,m,k,M).

Features
- Calculations History and reuse it
- Calculation history is automatically saved when exit app,can also scroll.
- Can use engineering multipliers,6 Special buttons
- Four user-defined constant
- Four interactive variable
- Three buttons can be insert formula
- interactive variable can have alias
- Functions: √,log,ln,sin,cos,tan,sinh,cosh,tanh,asin,acos,atan,asinh,acosh,atanh,e^x
- Built-in Constants:π,bk,q,e0 and Operator　^
- Autocomplete parentheses
- ON/OFF function key click sound
- Mail transmission function of the calculation history
- Built-in Online Help Viewer
- Universal App

There are also "e-calcFree" feature limited edition.