 Not one that you would use. Not like a doctor. Not super sensitive. You want it sensitive, but you want a mechanics one, which is made for these things. Right. If you use a block of wood, you can hear it clicking, but you can't hear that it goes to thud like a dirty injector because it's a piece of wood. Or a plastic screwdriver would do the same thing. So just make sure you don't touch an ignition coil when you're listening to the injector. No, that'd be bad. I've gotten shocked a couple times because it's been a little damp. It will zap you. It's been my hand. It's your shot. This is...