While I'm an iPhone user, I have this Android smartphone with me pretty much at all times because it has features that my iPhone doesn't have.
The Ulefone Power Armor 18T is a solid Android smartphone that's water-resistant, dust-resistant, can take hard knocks, and has a built-in FLIR thermal camera.
There's also the option to add a borescope, turning this into a toolbox you can keep in your pocket.
I've tried a lot of ruggedized Android phones, and a few with built-in thermal cameras, but this one is the one I like the best. It's tough enough to survive heavy use, the thermal camera is so very usable, and the phone has enough premium features to keep me happy.
Learn more about the Ulefone in my full review here.