Which tool is commonly used to check for moisture in walls?

A moisture meter is a specialized device designed to measure the moisture content within various materials, including walls. This tool is particularly effective in identifying areas where excess moisture may be present, which can indicate potential problems such as water damage, mold growth, or structural issues. Moisture meters work by using either resistance or capacitance technology to detect the amount of moisture in the material being tested.

Thermal cameras can be useful for visualizing temperature differences on surfaces, which can indirectly indicate moisture presence, but they do not measure moisture content directly. Electrical testers are typically used to assess electrical systems and cannot accurately determine moisture levels. Pneumatic tools are generally for mechanical applications and are not used for moisture detection. Therefore, the moisture meter is the most effective and common tool for this purpose in home inspections.