When a company's pitch to you is that their smartphone accessory was developed in cooperation with Raytheon, you're likely to listen. When that company then tells you they've built the world's first truly affordable thermal (infrared) camera and that it also attaches directly to your smartphone, you listen closely.

No, this isn't a gimmick, a trick, or some kind of workaround using widely-available technology to emulate thermal imaging. Seek Thermal is a real thermal imaging device that you can attach to your smartphone's microUSB port (Galaxy S4, S5, and Moto X / Moto G currently supported officially) and feed live video from the IR camera to the display.

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