Here is a cool gadget that turns your smartphone into a decent infrared thermal imaging camera. The CompactPRO plugs directly into your iOS or Android smartphone. It features a thermal sensor array of 320×240 pixels, 32-degree FoV, and adjustable span, level, and emissivity settings.
The CompactPRO works day and night. It comes with a waterproof carrying case. It has 7 modes, including Spot temperature, High / Low temperature, Level and Span, Above Threshold, and Below Threshold. Sets you back $499.