I think things like an IR temp gun, a pitch gauge, a volt meter, the proper screw drivers and allen wrenches, a soldering iron, heatshrink and a way to shrink it, like a heat gun or a lighter, zip ties, teflon lube, scissors, pliers,

I get alot of things from harbor frieght just because they are decent quality and really inexpensive, and well worth the money you pay.