Mine leave the shop, get rained on and get laid or dropped in the dirt. I use some of them for electrical work. All my Snap on tools look brand new and they are around 20 years old. I have some Craftsman wrenches that are twice that old and have no rust on them. The other day I found a part of a motorcycle tool kit. It was dirty, but not rusted and about 40 years old.
I got rain in my toolbox once and didn't notice it for a couple days. When I got back to that tool box (I have several) all the tools, including the Kleins, were rusted with the exception of the ratchet and socket kit I bought at Advance Auto.
Has anyone ever seen a SnapOn hand wrench with rust on it?
I no longer buy Klien anything. I have a pair of Channelok linesmans that cost about 12 bucks and are better than any of the Kliens I own. After about a year, cutting wire with Klien linesmans is almost impossible. Not so with the Channeloks.
I use cheap 5-1 screwdrivers. They don't grow legs like the Kliens do and you can afford to have several sets. The bit quality is lacking, but still good for many, many uses.
I spent many years as an ASE auto tech wrenching on cars before I came into the trade. The first thing I noticed was how crappy electrician's tools were, even the ever so popular Kliens.