You want your own personal calculator ? No Problem with the turned display color.
Very easy and fast.
Have Fun with it.
And sorry for the dark pictures and my bad english ;-)
Its my firt instructable
Step 1: Screw on Your Personal Calculator
Turn and Screw on your Personal Calculator.
Be Careful with the wires.
Step 2: Turn the Foil
Take out the display foil and turn it.
If the calculator is turned on, you will the the result.
Step 3: Finish
Close the Calculator and have Fun.