There are plenty of fancy, expensive thermal imaging camera on the market. Want to turn your smartphone into one? The TOPDON TC002 Thermal Camera for iOS has you covered. It has a resolution of 256 x 192p with 25Hz refresh rate. It has a range of -4 to 1022F. This thermal camera is designed to work with iPhone and iPad. It lasts up to 10 hours depending on the device you use.
This gadget has an effective distance of 16.4ft. It has 11 palettes for you to choose from. It can detect temperatures with 0.1F accuracy. A picture in picture mode is available that combines IR and visible imaging.