General Tools MM8 LCD Moisture Meter | Pinless, Non-Invasive Humidity Detector

Smart moisture monitoring for DIYers and professionals

Keep basements, bathrooms, and roofs dry with the General Tools MM8 LCD Moisture Meter. This pinless device reads moisture content without scratching surfaces, delivering quick, reliable data when you need it most. The hi-visibility white-on-black LCD remains legible from any angle, even in dim spaces, helping you make informed decisions without guesswork.

Non-invasive, surface-safe sensing

Designed with non-marring sensing technology, the MM8 checks moisture without penetrating finishes. It’s ideal for delicate wallpapers, painted walls, and finished surfaces, letting you scan drywall, masonry, or wood without leaving marks or damage.

Clear readings you can trust

The meter features 2-inch (50 mm) backlit digits for easy viewing, auto-calibration for accuracy, and a visual/audible status system. A three-color LED bar graph quickly communicates moisture levels, while the ergonomic handle makes longer checks comfortable.

Versatile settings and alarms

• Humidity readings tailored for drywall, masonry, softwood, and hardwood.
• Separate out-of-range alarms help distinguish between wood and building materials.
• Green, yellow, and red LED indicators highlight moisture risk at a glance.
• Hold function freezes the current reading for later review.
• Depth sensing reaches up to 3/4" (19 mm) into the surface with relative readings for some materials.

Practical uses in homes and projects

• Check framing and concrete before remodeling to anticipate moisture issues.
• Screen bathroom walls and basements for hidden leaks that can lead to damage or mold risk.
• Inspect roofs or attics where moisture may accumulate over time.
• Use during construction or restoration to compare moisture across different materials.

Built for craftsmen, DIYers, and professionals, the MM8 blends simple operation with dependable data. It runs on a standard 9V battery and includes a low-battery alert. With its ergonomic design and pinless, non-invasive sensing, you can measure moisture confidently while protecting surface finishes.