Originally Posted by
noglider
Basically, anything will do, as shown by [MENTION=381793]gugie[/MENTION] above. But the heavier and stabler it is, the easier and quicker it is. The heavy ones are expensive, and the price doesn't justify occasional use for most people.
For a moment I felt I was the only one that though that. Why? Unless you're doing it for hire -- or I suppose some guys just love "scanning for lifeforms?"
Honestly, I once tried feverishly to true my wheel and after days (weeks actually) of mediocre trial and error results I threw in the towel and took it to my LBS. The mechanic there did in an instant what I couldn't do in days and the wheel was tack perfect ever since.