I have a couple of ISF calibrationist if you will... in my area and I was wondering if I'm going to shell out all that cash for a calibration...What questions should I ask (aside from the obvious ie...T.V. manufactor, hours of operation so forth ) to ensure that One he knows what he's doing....He (or she LOL) has the proper equipment...What should I look for as I'm standing over his back watching him...and finally how long should it take. I've believe I'm pretty well armed as far as the info goes in this forum but I don't want to miss anything. Can anyone maybe provide a list of the essentials that one should ask???