You've got your channel locks, your basin wrench, your multi-tool. Cool. But there's one thing I see green guys missing all the time: a simple inspection mirror.
Not a fancy borescope. Not a camera. I'm talking about a telescoping mirror that folds flat and fits in your bag.
When you're under a sink and can't see the back of that supply line connection because the disposal is in the way — that mirror saves you 20 minutes of guessing. You hold it up, angle it, and boom — you see exactly where the drip is coming from.
I've watched guys pull out entire cabinets trying to trace a leak that a mirror would've spotted in 10 seconds.
What's one cheap tool you swear by that most guys overlook?