|FLIR-ONE infrared image of classroom just after students left - N. Carlson|
I am currently weighing the purchase of two low cost IR camera attachments. A FLIR One and a Seek thermal imager. The models that can be used on some android phones and other models that can be used on most i-phones. Because of the location of the charger on some android phones it will be necessary to use cord to allow camera to attach to the phone. The FLIR One needs a battery to operate the Seek does not. The FLIR has better image quality with a wider field of view. The Seek has a wider temperature range.
Amazon has the FLIR ONE Thermal Imager for Android available for less than $300.