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Many surveyors are confused about the role and accuracy of moisture meters. Draws upon extensive field experience of their use and reports the findings of laboratory testing of various materials with the most frequently used moisture meter. The meter is tested in pin probe and “search” modes on timber, PFA block, lime plaster and plasterboard. The resulting graphs help to explain what the meter reading on screen actually means and can only help surveyors get more out of the meter to diagnose dampness more effectively.

This paper discusses the concept of “monitoring” moisture content (MC) as a surveying aid in connection with appraisal of buildings and when assessing the drying out of buildings, for example, after flooding damage. It also presents the findings of testing of various instruments to record the drying out of brick, timber and cement screed specimens. Conclusions are drawn on the most appropriate methods for the surveyor to use when monitoring the MC of construction materials.