I am surprised nobody has mentioned this yet but the single most useful tool to have during the robotics season is a Leatherman (or an equivalent multi-tool from another company). I suggest that at least a few of your members carry multi-tools with them at all times because, even though they are not the most effective tools for the individual components they have, the ability to carry all of those items with you is priceless.
If students possessing knives on school property is an issue for you like it is with us i suggest the Leatherman Knifeless Fuse
http://www.leatherman.com/products/t...se/default.asp which team mates of mine and I carry.
Hope this helps
Simon Strauss
1155