Home Depot has 4-in-1 Pin/Pad Moisture Meter with Humidity and Temperature Display for $55.
The General Tools 4-in-1 Pin/Pad Moisture Meter is ideal for locating water leaks and measuring the moisture content of drywall, plastered walls, floors and subfloors. It includes a pin-type resistance-based sensor and a non-marring (pad) inductive sensor. The meter holds moisture readings for convenience and features a high/medium/low audible indication of moisture levels.
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Lowest price elsewhere is $84 from a reputable source.
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