An important calculator key is missing. The key to switch the plus or minus of the number.
It's an OK calculator with decent calculation options, however, it's a very small calculator and the only way I could find to resize it was to set my screen resolution very low otherwise if you are running 1680x1050 or higher like me, it remains a fairly small work area. The sound on wouldn't be bad but it creates a popping sound when used and is annoying.
I also noticed it's not quite so fast when you do fast button pushing on the num pad on the keyboard. It seems to lag a number behind which can goof up your thinking that you've typed in something or not. The cause it seems is the sound on option. Turning that off solved it.
For someone else this may be a nifty, small calculator but for my use, it needs improvement.
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