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Find problems with cooling systems on desktop and laptop systems.
Spot binding brakes on cars.
My tip for learning to use a thermal camera is to use it to look at things when they aren't faulty -- your radiators, car brakes, electrical stuff, anything -- and that way you get to know how things should look, so you can tell when things aren't working right.
I find the thermal camera so useful that I turn to it without thinking about it. Just now I wanted to know if an electrical appliance was getting power. Instead of reaching for a multimeter, I used my thermal camera to see if anything was warming up on the inside. Once I saw components heating up, that eliminated a load of possible problems.
I've been testing a number of thermal cameras -- both cameras that are standalone and cameras that attach to smartphones -- and the InfiRay P2 Pro is the best. It's small, the macro lens makes it super flexible, it's fast and accurate, and it doesn't need to be charged up separately.
This is a fantastic addition to any repair toolkit, and thanks to the coupon available on Amazon you can get $50 off the list price of both the Android and iPhone versions.