Why do you need one that is "coolant proof" anyway? Working with a lathe? I've got several Starrett mikes. 0-1, 1-2, 2-3, & 3-4. I also have a bore mike, 3 dial calipers, a 0-2 depth mike, and 2 Snap-On dial calipers. Other than the bore mike and the Snappy on... Login to read more.