Michael gave the reasons a tablet isn't a very good candidate for calibrating already, he shouldn't have to do it again.
1) the software really needs a mouse to work, a finger just doesn't get it (I'm personally a mouse hater, track-ball all the way for me. Takes no space at all, can even be used on the arm of a theater chair)
2) to use a mouse, you have to have some kind of port on the tablet that's compatible with a mouse, usually that means a USB port or maybe Bluetooth if there are any Bluetooth mouse products that will pair with something other than a USB Bluetooth controller for the mouse which defeats the whole purpose because youd still need a USB port for the Bluetooth mouse controller).
3) The meter itself needs a port of some kind... usually USB also and there's no way around that. If the tablet has no ports, you can't connect your meter
4) You can get tangled up in wires and drop the meter or tablet or both so you probably want the tablet sitting on a table while you use a trackball (or much less convenient mouse) to control the software so if you want to type, then you need a remote keyboard on your lap that's compatible with the tablet.
And I'll add a 5th reason...screen size... my screen never seems to be as big as I'd like it to be for calibration purposes. Since tablets tend to have smaller screens than laptops, that just makes the problem worse.
If you can find a tablet with a large screen, has USB ports, has a stand to hold it on a table so it's out of the way and you have a keyboard you can use with it and a trackball or mouse... you could calibrate with a Windows tablet but no other kind since calibration software only exists for Windows at this time.