Seeing the unseen is one of the great things about using an infrared (IR) camera, and even the cheap-ish ones that plug into a smartphone can dramatically improve your hardware debugging game.
Carrying a pro camera at all times is difficult, but a smartphone camera can't do everything a dedicated one can. These phone lenses are the compromise.
You frame the photos through a pop-up optical viewfinder, which also turns the camera on. The digital images captured by the Snap had reasonable levels of detail, but colors were rather flat.