General Tools MMH800 4-in-1 Pin/Pinless Moisture Meter with Temp & Humidity

Overview

Meet the General Tools MMH800, a rugged 4-in-1 digital moisture meter designed to help you gauge moisture patterns across wood and building materials. It combines pin-type and pinless sensing in one compact unit, giving you versatile testing options for spots or larger areas. Clear readings and practical features support informed decisions about dampness, potential risk areas, and next steps for maintenance or remediation planning.

What it measures

The meter reports a humidity level to indicate ambient dampness, a moisture percentage for wood and materials, and an ambient temperature display. It includes a °F/°C switch and audible/visual cues that categorize moisture as high, medium, or low. For wood, the moisture range is 5%–50%; for building materials like concrete and drywall, 1.5%–33% provides a useful basis for assessment.

Sensor options and accuracy

Test surfaces with pin-type probes for precise, spot readings or switch to the pinless flat-pad sensors for broader coverage. The device offers both displays for moisture content and keeps you informed with ambient temperature readings. When moisture levels are detected, you’ll see clear indicators that support quick decision making.

In the box and design

Designed for comfort, the MMH800 features a sturdy, ergonomic shape with rubber side grips for steady handling during multiple measurements. It ships with a solid 9-volt battery, a lanyard, two sets of spare pins, and a user’s manual—everything you need to get started.

Hold, diagnostics, and convenience

The hold function lets you save a reading to view later, while an auto diagnostic check helps ensure readings are reliable. An auto power-off after 3 minutes helps conserve battery life between uses.

What you gain

• Clear, actionable data on moisture and humidity to guide next steps
• Flexible testing with pin-type and pinless sensors for small spots or larger areas
• Temperature and ambient humidity shown alongside moisture percent for context
• Audible and visual indicators for moisture levels to support quick planning

Real-world use cases

• Spot-check damp basements, crawl spaces, kitchens, and bathrooms
• Assess moisture content in wood framing, drywall, and concrete
• Monitor suspected leaks and track moisture changes over time
• Keep readings handy with the hold function for documentation

General Tools provides a broad selection of precise tools for DIYers and professionals, helping you measure better and work smarter in everyday projects.