tablet pc tilt for contrast?!

[donm]

for all you guys who own a tablet pc I have one question: how do you tilt your screen to get an accurate contrast of values while painting?! I find if its not perfectly tilted it looks like rubbish when I bring it to my desktop...

[donm]

you can delete this post moderator, but if anyone else is interested I found some inclining tablets to place your laptop on...this may help (at least keeping it steady)