Matterport

Thermography makes pictures from heat, not visible light. ... Thermal cameras detect more than just heat though; they detect tiny differences in heat – as small as 0.01°C – and display them as shades of grey and black, or with different colors. This is a completely different technology that produces irrefutable evidence.

Thermal imaging works by detecting subtle changes in temperature caused by the
presence of moisture. A thermal imaging camera can help you trace
the water back to its origin. Finds Hidden Problems. It's an incredibly useful tool, and
not only to find the source of leaks, but to determine either hot or cold air exiting, or
entering around windows and doors.

In this Thermographic image to the right you can clearly see the water and moisture in the wall. The darker area in the far right window portrays an area that is saturated with water. Further to the left you see shades of water and moisture present.