calcS16lite app for iPhone and iPad

This is calculator. CalcS16 free
-. FreeVersion, (no ad banner).
-. Hexadecimal calculation.
-. Moving-view is implemented for typing miss.
-. Use variable font size for misreading.
-. Support metric prefix.( G,M,k,m,u,n,p)
-.Support SplitView/SlideView(iPad)

Flick to up/down, you will be understand the operation.
when you want to g the numeric pad.
"S" key is recommended.

detail
. This is the calculator app with sequential processing.
. Mixed calculation of hexadecimal is possible.
. if you do not touch screen during 30s. then screen change to clock.
. Backgound color is changed by a time.( 0-10:Blue 10-16:Green 16-24:Red)
. add metric prefix : "exp" double touching.
. convert metric prefix : "=" double touching.
please give me advise  for usability improvement.