Both penetrating and non-penetrating moisture meters should be part of the estimator’s tool kit. They range in price and features, from $50 to a couple hundred of dollars.

See: Mac Pearce: “Mold & Rot: Look Before You Leap When Weatherizing”
Home Energy, Home Performance Special Issue, 2006

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I recommend the Delmhorst BD-2100 that I purchased about five years ago for around $350. They have probably come down since then, but it has proved invaluable to me. If I am not mistaken the Users Manual can be googled and downloaded if anyone is interested in learning more about it.

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