I use a Fluke 8810A that sits on a shelf above my work bench for normal troubleshooting.
I had another one, sitting below it, that was not powered on and became infested with ants (apparently attracted by the plastic housing). That unit failed and I had to scrap it.
The remaining unit (which was powered on all that time) is still going strong.
Thereafter, I found Terro Ant Killer II (borax based) to be an effective method to keep ants away from the shelves, placing a few inch-square pieces of cardboard, each with a large drop, in strategic locations. (Avoid food preparation areas.)