Which device is used to locate hidden leaks by sensing heat differences?

• A. Infrared camera
• B. Moisture meter
• C. Both infrared camera and moisture meter
• D. Acoustic detector

Answer: (C)

Heat-difference sensing is about spotting temperature variations that reveal where moisture is affecting materials behind walls or ceilings. An infrared camera does this by detecting infrared energy (heat) and turning it into a thermal image. The resulting temperature patterns help you see warm or cool spots caused by leaks, moisture intrusion, or poor insulation, all without invasive probing. A moisture meter, by contrast, measures how much moisture is in a material using electrical resistance or capacitance. It doesn’t read temperature differences, so it can’t locate a leak based on heat alone. It can be useful after an infrared scan to confirm dampness and gauge moisture levels, but the heat-based leak location comes from the infrared camera.