Do you work in the water damage, restoration industry?
Mold growth on walls and ceilings is a sure sign of high humidity, condensation and/or a water leak hidden somewhere within the ceiling, walls, or finished flooring. It displays the level of moisture content as soon as the metal prongs contact the material to be inspected. Perhaps you need to determine if your sheetrock has absorbed too much water to keep it in use? This PREXISO moisture meter is designed for measuring moisture content in drywall, sheetrock and plaster walls, in addition to sawn lumber (paper and cardboard too), and materials that harden - like mortar and concrete.