General Tools & Instruments MMD950 Pin and Pinless Deep Sensing Moisture Meter with Spherical Sensor and Remote Probe
Ideal for contractors, woodworkers, and homeowners, this new precision specialty instrument is commonly used to detect moisture and water damage under tiling, locate moisture in sub-floors beneath carpeting and wood flooring, and check moisture in masonry.  Two different modes enable users to measure moisture in corner, hard to reach areas, narrow spaces and uneven surfaces.  The spherical sensor measures the average moisture level up to a depth of 4-inches and its small contact area provides superb repeatability.