FLIR Systems Inc. is launching its first consumer product, an iPhone jacket that contains a heat camera. Temperature differences show up in different colors on the screen. For instance, you can set it to show hotter things in yellow, medium-hot in red and cold in purple.
The FLIR One will cost $349, which compares with $995 and up for FLIR's professional thermal imagers. The resolution of the thermal image is low, but the jacket also contains a regular, visible-spectrum camera and overlays the images for a more detailed picture. The phone can record video or stills of the heat images.
What you could use it for
The thermal camera can detect temperature differences of about one-tenth of a Fahrenheit degree, and the temperature readout is accurate to within 2 degrees.