From the Manufacturer
This hand-held moisture meter is popular with installers, woodworkers, cabinetmakers, furniture makers, contractors, and quality-assurance inspectors. It enables you to avoid the headaches of splitting, warping, delaminating, and failed glue joints that can result when hidden moisture is present in your work. The meter uses advanced electromagnetic wave technology to accurately measure wood moisture content from 5 to 30% to a depth of 3/4 inch. The pinless design eliminates the unsightly holes left by other moisture meters. The compact portable size allows you to check boards top to bottom in just seconds.