As others said, a good, timeless reminder.
I bought one of the laser thermometers and use it to check wiring. I can point it at a wire and get a dead on reading. I, also, use it to check the breakers.
To test it, I fire up one of my collectors and point it at the breaker. Even with 15 foot long, 10 gauge wire, for a fifteen amp, 240 circuit, you may get a couple degree rise at the breaker. The thing is instantaneous, so will show a sloppy outlet or other problem very quickly.
Even if renting, it's worth while to swap out sloppy outlets with good quality, twenty amp puppies. The nice ones are easy to change and will last years longer than the cheap stab type.
The reason I have what you want is, I never lent it out before.
Scraps are a myth.