Cat Phones (yes, Caterpillar Tractor) offered the first phone with an IR imager. They intended this for industry and construction, where you're sometimes looking for things that are overheating, or heat leaks. It combines the visual and IR images, so you can see the outlines of what you're looking at. Their customer base has a real use case for this feature.
Like other Cat phones, but unlike the USB-port devices, it's not fragile.[2]
Like other Cat phones, but unlike the USB-port devices, it's not fragile.[2]
[1] http://www.catphones.com/en-us/ [2] https://www.youtube.com/watch?v=mVPku-xItv8