The General Tools MMD4E is a digital, pin-style moisture meter designed to help professionals and homeowners detect hidden moisture levels in wood and building materials.

• Functionality: It features a dual-mode selector to switch between measuring moisture in wood versus other building materials (like drywall or masonry).

• Ease of Use: It includes a large, backlit LCD screen, an audible alarm for high moisture detection, and a "Reading Hold" button that freezes the display, allowing you to capture measurements in hard-to-reach areas.

• Calibration & Reliability: The protective pin cap doubles as a calibration checker to ensure the device remains accurate. It operates with a moisture content range typically between 5% and 50% for wood and 1.5% to 33% for building materials.