When I did electrical, I loaned a meter and a couple other tools which never came back. It took one good meter not to come back to somewhat learn your lesson. And I've loaned stuff only to get it back looking like it had been ran through the ringer..
You do get a protective of your stuff, it's one reason if I do borrow, I try treat it as if it was my own. it's a shame it takes one person to burn you
Even my truck, when the daughters would like to borrow it, I frown and become a little jaded. I know they like to let kids eat in the vehicles and I've had to clean for a couple days. I'll still will let them borrow, but with harsh warnings. it just kind of pi$$e! you off when there is no respect.
OK, sorry, that was my soapbox for the morning and getting off track
Ron