I've spent the last year running over to the laptop with my hands covered in chips and coolant whenever I need to do some simple calculations on the windows calculator..probably not the best idea..

I tried buying a super cheap calculator at walmart but it was SO cheap it literally did not work out of the box.

So has anyone figured out a great calculator for the mill? I would think the following would be must-haves:

-semi-water & chip resistant or at least "hasnt died yet with coolant/chip covered fingers"
-big display?
-big buttons
-reasonable battery life
-less than $10