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General Tools

General Tools Compact Digital Moisture Meter MMP100 – Pin-Style Tool Detects Moisture in Wood and Building Materials to Help Identify Targeted Moisture Levels and Prevent Water Damage

  • Based on 26 reviews
Condition: New
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Availability: In Stock.
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Arrives Wednesday, Jun 25
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Features

  • COMPACT, PIN STYLE DESIGN: Reliably measure moisture content in wood, drywall, and other building materials with the precision of most standard-size meters - all in a lightweight, portable design
  • EASY MOISTURE DETECTION: Easy-to-read tri-color LCD display shows moisture percentages, with green, yellow, and red backlighting to quickly and easily identify moisture ranges from low to high.
  • JOBSITE-FRIENDLY DESIGN: Built tough with a secure tethered protective cap and convenient data hold function that locks readings for easy reference and recordings
  • RELIABLE PERFORMANCE: Smart power management with built-in low battery indicator ensures reliable operation and prevents unexpected shutdowns during moisture detection tasks
  • VERSATILE APPLICATIONS: Perfect for multiple uses including home inspections, drywall and flooring installation, woodworking projects, and checking firewood

Description

Detect moisture with precision in the palm of your hand. This compact moisture meter delivers reliable moisture readings for both DIY enthusiasts and trade professionals, perfect for everything from home inspections and drywall installation to flooring projects, woodworking, and checking firewood. The intuitive tri-color LCD display instantly shows moisture levels in wood, drywall, and building materials, helping you prep for your task or identify postential moisture issues before they lead to damage. Built for real-world use with thoughtful features like a tethered protective cap and data hold function, this compact design matches the accuracy and precision of most standard-size moisture meters. Replaceable pins sold separately About General Tools: At General Tools, specialized is our specialty. With over a century of experience, we're the trusted choice for specialized precision tools. Approved by skilled tradesmen, DIYers, and craftspeople, our tools are your sidekick for bringing your ideas to life and getting to that satisfying "job well done" feeling.

Color: Black


Brand: General Tools


Product Dimensions: 0.98"W x 6.89"H


Lower Temperature Rating: 32 Degrees Fahrenheit


Operating Humidity: < 90%


Color: ‎Black


Brand: ‎General Tools


Product Dimensions: ‎0.98"W x 6.89"H


Lower Temperature Rating: ‎32 Degrees Fahrenheit


Operating Humidity: ‎< 90%


Upper Temperature Rating: ‎122 Degrees Fahrenheit


Voltage: ‎3 Volts


Manufacturer: ‎General Tools


UPC: ‎681035018576


Part Number: ‎MMP100


Item Weight: ‎4.2 ounces


Country of Origin: ‎China


Item model number: ‎MMP100


Batteries: ‎2 AAA batteries required. (included)


Size: ‎Pin Type


Item Package Quantity: ‎1


Measurement Accuracy: ‎+/-2%


Special Features: ‎Data hold function that locks readings for easy reference and recordings


Included Components: ‎Moisture meter, (2) AAA batteries


Batteries Included?: ‎Yes


Batteries Required?: ‎Yes


Battery Cell Type: ‎Other Than Listed


Date First Available: January 17, 2025


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Wednesday, Jun 25

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Top Amazon Reviews

    • 🔥 A Must-Have Moisture Meter for Firewood!
I use this moisture meter primarily for testing how dry my firewood is, and it works perfectly. No more guessing when the wood is ready to burn! It’s also great for checking moisture levels in treated lumber to ensure it’s dry enough before staining or sealing a deck. Additionally, I tested it on concrete, and it worked, though repeated use on hard surfaces may wear down the tips over time. One great feature is the built-in calibration chip inside the cap, which allows you to verify that the meter is reading accurately. Mine was calibrated perfectly—it read 18.3% in wood mode, which is right in the middle of the recommended range of 17.3% to 19.3%. This gives me confidence in its accuracy and reliability. The moisture detection range is quite broad: Wood Mode: Detects moisture from 5% to 50%. Building Material Mode: Detects from 1.5% to 33%. The color-coded display makes it easy to interpret moisture levels at a glance: Wood Mode: 🟢 Green (5% – 11.9%) = Low moisture 🟡 Yellow (12% – 15.9%) = Moderate moisture 🔴 Red (16% – 50%) = High moisture Building Material Mode: 🟢 Green (1.5% – 16.9%) = Low moisture 🟡 Yellow (17% – 19.9%) = Moderate moisture 🔴 Red (20% – 33%) = High moisture The General brand has always been reliable for me, and this meter is no exception. It comes with two AAA batteries, so it’s ready to use right out of the box. The bright display is easy to read, and operation is super simple—just two buttons: one to turn it on and one to switch material types. ⚠️ Caution: The prongs are very sharp, so be careful when handling them! Fortunately, it comes with rubber protective covers and a plastic cap attached to a shock cord to keep them safe when not in use. At just $20, this is an awesome buy! You get an accurate, easy-to-use moisture meter that works on a variety of materials and helps take the guesswork out of drying times. If you burn firewood, work with lumber, or need to check moisture levels in building materials, this tool is a must-have. Highly recommend! ... show more
Reviewed in the United States on February 10, 2025 by L33der
    • Checks moisture!
Used this for testing - wood is ready for wood working - quick sanity test for water damage on hardwood floors or walls I confirmed that the values are within expected range. Good brand and working product with great value!
Reviewed in the United States on April 12, 2025 by Ronald Irene
    • ⭐⭐⭐⭐⭐ Accurate & Easy to Use – A Must-Have for DIYers! 🔍💧
Pros: ✔️ Accurate moisture readings 📊 ✔️ Compact and lightweight – easy to carry 🎒 ✔️ Simple one-button operation ✔️ Works on wood & other building materials 🏠 ✔️ Helps prevent costly water damage 💰 Cons: ❌ Pins need careful handling to avoid marking surfaces Summary: The General Tools Compact Digital Moisture Meter MMP100 is an essential tool for detecting moisture levels in wood and building materials. 🏗️ Whether you're checking for water damage, prepping wood for a project, or ensuring proper drying, this meter delivers quick and accurate readings. ✅ The compact design makes it easy to carry, and the simple operation is perfect for both professionals and DIYers alike! The pin-style detection is precise, though you’ll want to be mindful of the marks it can leave on delicate surfaces. Overall, if you want to prevent costly repairs and catch moisture issues early, this tool is a fantastic investment! 🛠️💡 ... show more
Reviewed in the United States on March 21, 2025 by Omri Ran
    • Peace of mind
I had a leak in my chimney a few years back and ever since then I've been paranoid that it's still leaking. This moisture meter has given me peace of mind. It's easy to use and it's a great price at just $20. I tried it a few different places around the house to check it's accuracy and it appears to be accurate. If you want to prevent potential water damage to your house or need to verify leaks have been fixed, this is a great tool to have on hand. ... show more
Reviewed in the United States on March 17, 2025 by Snarky Seagull
    • Handy little tool.
General Tools Compact Digital Moisture Meter is a very handy tool and I am pretty sure my husband has used it on every surface in the house at this point. Very easy to use and to read, great for anyone that might be worried about moisture in their home. Due to it's small size it can also be stored just about anywhere. ... show more
Reviewed in the United States on March 23, 2025 by Tracy L.
    • Descent contact moisture meter by General Tools that gives a quick, consistent reading
The direct contact pin probe moisture meter by General Tools, model MMP100, is made in PRC (china). The package for the meter also included two AAA-batteries for use in the meter. The cap of the probe also contains a calibration check for wood mode, and my meter measured 18.2% using the calibration contacts. I have found this meter to give quick, consistent results. I have a more expensive meter that I consider more accurate, but compared to this $15 contact meter, the MMP100 is close enough for the price. This meter has a small pen shape, and fits into hard to get areas easier for me. This meter only measures moisture in wood and drywall. The meter is ready to use once the batteries are put in. This meter has a maximum reading of 50% for wood and 33% for drywall. 4 stars ... show more
Reviewed in the United States on February 26, 2025 by Joe and Jane User
    • Great tool for a casual DIYer
I initially thought that since I'm not involved in any wood working, and our home has a nice gas fireplace my use case for this moisture meter was going to be mostly under its "building materials" mode. After a crazy snow and rain period, we had some leakage to the crawlspace area form a corner that reached the joists. We took the necessary steps of drying the area and treating the joists for mold. Now, using this tool, I'm able to monitor the dryness and determine if further action is needed... for this particular task, I needed to be in the wood mode, which shows that this functionality is not limited to testing wood to determine if they're ready to burn. In addition, I've used it in drywall and porous concrete blocks to monitor wetness. It works great, the price is right and the size makes it very easy to store and carry it. This might be small potatoes for some outthere, but for a DIY home owner, it's perfect! Highly recommended! ... show more
Reviewed in the United States on February 14, 2025 by Avid Shopper
    • Reliable!
Didn't know I needed this until I starte dusing it. Great for so many things around the house...especially in the shop. Seems to be very accurate. Quality is great and so is functionality. No complaints!
Reviewed in the United States on March 27, 2025 by BYOB

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