Q. Can moisture meters give false readings?

Answer

Non-penetrating moisture meters measure moisture in a different way and for a different purpose but metal also causes them to give false-positive readings because it impedes their ability to locate moisture's presence. Metal is one of several modern building materials which are used in the construction of structures. Metals such as screws nails pipes wires and support beams can cause false/positive readings in pin-type and pinless moisture meters respectively. Condensation forms on cold surfaces because of the relationship between temperature and humidity. When testing material a thin film of moisture might form if the test environment and the material are at different temperatures.