I have an OBD-II scantool, a nice Fluke meter, and a set of R134a gauges. I can't seem to keep the A/C gauges in good enough condition where they don't leak. I'm probably going to have to upgrade to a nice set of yellowjacket gauges or something. As for the specialty tools, I borrow them from AutoZone; though, now that I have a relative that works there, I might start buying them with his discount. The OEM brand tools they rent seem to be pretty good and they have lifetime warranties on them. Seems like it's a cheaper way than Snap-On to get those specialty tools you don't use too often but would like to have on hand.