Cell phone Infrared camera -FLIR One

FLIR-ONE infrared image of classroom just after students left - N. Carlson

The above image shows dark seats where students did not sit and purple colored seats where students were sitting at a class where I had just been a guest lecturer.

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.

FLIR-ONE versus SEEK infrared camera - 3 minutes