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General Tools MMD4E Digital Moisture Meter, Water Leak Detector, Moisture Tester, Pin Type, Backlit LCD Display With Audible and Visual High-Medium-Low Moisture Content Alerts, Grays

4.5 out of 5 stars 14,283 ratings
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Purchase options and add-ons

Color Gray
Brand General Tools
Product Dimensions 9.5"W x 1.4"H
Battery Description Alkaline
Lower Temperature Rating 32 Degrees Fahrenheit

About this item

  • HUMIDITY SENSOR: Our handy meter tool can quickly determine what level of remediation is needed to keep your family safe from black mold. High levels of dampness that go untreated are the leading cause of harmful fungus growth in the home.
  • WATER LEAK DETECTOR: Finding the moisture content in your wood or drywall is the first step in early prevention. Continuously check and test suspicious water stains around the house so you can determine whether the area is wet or has already dried. Low, medium and high moisture tones and on-screen icons, Reading HOLD button
  • MOISTURE READER: The mold test features large 0.3" high digits in a backlit LCD for quick and easy detecting. Our mildew scanner includes extra 8mm stainless steel pins, a protective cap that doubles as a calibration checker, and a “9V” battery.
  • MOLD TESTER: For an accurate test read, stick the stainless steel pins into the surface of what you're measuring. The gauge has a broad range of 5 - 50% for wood and 1.5 - 33% for building materials such as concrete and drywall.
  • GENERAL TOOLS: We're a recognized leader in designing and developing specialized precision tools dedicated to delivering exceptional customer service. We encourage artisans and DIYers to work smarter, measure better, and repair more productively.

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Product guides and documents


From the brand


From the manufacturer

Pin Type Moisture Meter by General Tools
Works on drywall, plaster, carpet, floors, lumber, and more
Used for mold remediation, home inspection & renovations, firewood, and freeze drying food

Pinpoint Accuracy

Pinpoint Accuracy

Pin meters find moisture spots more quickly and accurately than pinless meters that can only test broad, flat surfaces

Replacement Pins

Replaceable Pins

Easily replace any bent or curled pins with the PIN3 replacement pins

Large LED

Easy to Read LED Screen

Includes a hold button to freeze and hold readings

MMD4E
MMD7NP
MMD950
MM8
RHMG650
Replacement Pins for MMD4E & RHMG650
Customer Reviews
4.5 out of 5 stars 14,283
4.4 out of 5 stars 3,867
4.4 out of 5 stars 281
4.3 out of 5 stars 767
4.0 out of 5 stars 62
4.5 out of 5 stars 312
Price $29.96 $49.99 $185.25 $45.67 $199.08 $13.89
Deep Read Pins no data no data
Deep Sensing Probe no data no data no data no data no data
Pinless no data no data
Measures Moisture no data
Backlit LED Display no data

Product information

Technical Details

Color ‎Gray
Brand ‎General Tools
Product Dimensions ‎9.5"W x 1.4"H
Battery Description ‎Alkaline
Lower Temperature Rating ‎32 Degrees Fahrenheit
Mounting Type ‎Surface Mount
Operating Humidity ‎Varied
Voltage ‎9 Volts
Manufacturer ‎General Tools
UPC ‎012301860924 716080037835 885312937219 885265551395 885367884865 681035414477 069060294668 031112659039 885898031110 522536779064 971483008299 031113382226
Global Trade Identification Number ‎00885265551395, 00681035414477
Part Number ‎MMD4E
Item Weight ‎5.6 ounces
Country of Origin ‎China
Item model number ‎MMD4E
Batteries ‎1 Product Specific batteries required. (included)
Is Discontinued By Manufacturer ‎No
Size ‎Pin Type
Style ‎Digital Pin Type, Visual & Audible Alerts
Pattern ‎Digital Moisture Meter
Shape ‎Drywall
Power Source ‎Battery Powered
Item Package Quantity ‎1
Measurement System ‎Metric
Usage ‎Inside; Amateur, Inside; Professional
Included Components ‎Moisture meter, batteries, extra pins
Batteries Included? ‎Yes
Batteries Required? ‎Yes
Battery Cell Type ‎Zinc Carbon
Description Pile ‎Alkaline
Warranty Description ‎1 Year

Additional Information

ASIN B00275F5O2
Customer Reviews
4.5 out of 5 stars 14,283 ratings

4.5 out of 5 stars
Best Sellers Rank #619 in Tools & Home Improvement (See Top 100 in Tools & Home Improvement)
#1 in Moisture Meters
Date First Available July 19, 2008

Warranty & Support

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For warranty information about this product, please click here [PDF ]

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General Tools MMD4E Digital Moisture Meter, Water Leak Detector, Moisture Tester, Pin Type, Backlit LCD Display With Audible and Visual High-Medium-Low Moisture Content Alerts, Grays


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Product Description

General’s ultra-sensitive Digital Moisture Meter easily detects hidden leaks in wood, concrete, plaster and carpet. Providing accurate moisture level readings make this moisture meter great for new home inspections, locating roof leaks or even selecting dry lumber at the yard. Ideal to use in woodworking, building construction, agriculture restoration and floor-laying. Used to check wood, drywall and concrete before painting, sealing or treating and locate and identify water leaks in roofs, floors and walls. Features LED display, wide measuring range, strong stainless steel pins, audible alarms and battery status indication. Display will show the moisture content in “Percent Moisture Content” directly. Ergonomically designed and CE approved.

Top Brand: General Tools

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General Tools MMD4E Digital Moisture Meter, Water Leak Detector, Moisture Tester, Pin Type, Backlit LCD Display With Audible and Visual High-Medium-Low Moisture Content Alerts, Grays
General Tools MMD4E Digital Moisture Meter, Water Leak Detector, Moisture Tester, Pin Type, Backlit LCD Display With Audible and Visual High-Medium-Low Moisture Content Alerts, Grays
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Price-40% $29.96
List:$49.95
-7% $27.98
List:$29.99
$49.99-17% $24.99
List:$29.99
$39.95
Delivery
Get it as soon as Friday, Apr 18
Get it as soon as Friday, Apr 18
Get it as soon as Friday, Apr 18
Get it as soon as Friday, Apr 18
Get it as soon as Friday, Apr 18
Customer Ratings
Sold By
power source
battery quantity
operating humidity
mounting type

Important information

Bulb Voltage

9 volts

Customer reviews

4.5 out of 5 stars
14,283 global ratings

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Customers say

Customers find the moisture meter works well and is easy to use, taking less than a second to read and being particularly effective on hardwood floors. They appreciate its value, noting it has saved them thousands of dollars, and consider it a helpful tool for various projects. The accuracy and build quality receive mixed feedback - while some find it extremely precise and reliable, others report inaccurate readings and durability issues with bent pins.

AI-generated from the text of customer reviews

1,046 customers mention "Functionality"886 positive160 negative

Customers find that the moisture meter works well and produces consistent results, with one customer noting it performs flawlessly on various materials.

"...The price was reasonable and it still works like new, 3 yrs after purchase." Read more

"Very good quality for the price point. Worked well on sheetrock areas" Read more

"...This meter can take a beating over time and still keep on working. Extremely good on battery life as well...." Read more

"...This moisture sensor was reasonably priced and worked very well...." Read more

638 customers mention "Ease of use"563 positive75 negative

Customers find the moisture meter easy to use, with quick readings taking less than a second, and one customer noting its simple 3-button operation.

"...you the range of information that other meters out there can, but it's simple and it does exactly what it's supposed to...." Read more

"...Its accuracy, versatility, and ease of use make it an invaluable asset for identifying and addressing moisture issues quickly and effectively...." Read more

"...- The instruction manual is easy to read and follow. They come in English, French, and Spanish. -..." Read more

"Works well, easy to use, affordable" Read more

452 customers mention "Moisture level"392 positive60 negative

Customers find the moisture meter effective at identifying moisture levels, particularly useful for checking firewood moisture content and detecting damp areas.

"...and heats with firewood, this device is very handy to determine optimum moisture content levels before stocking my woodshed with our winter..." Read more

"...features a wide moisture detection range, allowing me to accurately assess moisture levels in various materials, from wood and drywall to concrete..." Read more

"...on the back of the device (which is great), this means my ceiling is not very moist. Obviously that was good news...." Read more

"...Affordabile Ideal for Detecting Deep Moisture – Since the pins penetrate the material, they are more effective at detecting moisture..." Read more

372 customers mention "Value for money"372 positive0 negative

Customers find the moisture meter offers good value for money, with several mentioning it saved them thousands of dollars, though some note that more expensive models perform better.

"...The price was reasonable and it still works like new, 3 yrs after purchase." Read more

"Very good quality for the price point. Worked well on sheetrock areas" Read more

"...This moisture sensor was reasonably priced and worked very well...." Read more

"...Affordabile..." Read more

322 customers mention "Tool quality"312 positive10 negative

Customers find the moisture meter to be a useful tool that comes in handy for various tasks, with one customer specifically noting its value for woodworkers.

"...Its accuracy, versatility, and ease of use make it an invaluable asset for identifying and addressing moisture issues quickly and effectively...." Read more

"Super useful item. Works so good that it broke the news to me that the "seasoned" firewood I bought for $100 was in fact, not seasoned at all." Read more

"Useful - but qualitative not quantitative. -..." Read more

"This has been very helpful in determining if a stain on the wall is from a leak. Measures moisture in dry wall and wood...." Read more

411 customers mention "Accuracy"264 positive147 negative

Customers have mixed experiences with the moisture meter's accuracy, with some finding it extremely precise and consistent across different areas, while others report readings that are not as accurate as expected.

"...Since the General Meter was accurate and did work I went ahead and kept it also. I gave it 4 stars instead of 5 due to the probe tips." Read more

"...If the wood has less than 5% moisture content, the meter doesn't give any reading at all, so I when I tried to test it on a piece of kiln-dried wood..." Read more

"...It always seemed to be accurate as well, when compared to similar models from other brands that co-workers used." Read more

"...Its accuracy, versatility, and ease of use make it an invaluable asset for identifying and addressing moisture issues quickly and effectively...." Read more

250 customers mention "Build quality"129 positive121 negative

Customers have mixed opinions about the moisture meter's build quality, with some finding it well-made and reliable, while others report questionable quality and that it doesn't last.

"Very good quality for the price point. Worked well on sheetrock areas" Read more

"...Inconsistent Performance on Hard Materials – meter struggles with denser woods or materials that resist penetration, leading to unreliable readings..." Read more

"Reliable. If anyone buys firewood from a supplier this is definitely needed to test the dryness of the wood before they dump it...." Read more

"Probes seem flimsy" Read more

130 customers mention "Pin durability"37 positive93 negative

Customers report significant durability issues with the moisture meter's pins, noting that they bend after a few uses, break easily, and are flimsy.

"...UPDATE (7/31/2010): The pins broke when we were testing some brazilian walnut - one of the hardest woods out there...." Read more

"...Too bad. I would pay more for this meter. It seems fine except the low quality pins. $15 for replacements? Sure, if they were stronger......" Read more

"...It came with 2 extra pins and a battery. Not bad for the price of a moisture meter." Read more

"...to "insert" but don't twist or bend while inserting, the results are broken pins and no reading." Read more

Moisture sensor was reasonably priced and worked very well
5 out of 5 stars
Moisture sensor was reasonably priced and worked very well
We had some roof leaks and needed to check where they were to air them out. This moisture sensor was reasonably priced and worked very well. As you can see in the picture, it will light up red when there is substantial moisture in your walls. Very happy with the product and would recommend (not happy about my roof leaks!).
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Top reviews from the United States

  • Reviewed in the United States on January 27, 2025
    Pattern Name: Digital Moisture MeterVerified Purchase
    As a person who lives in rural Wisconsin and heats with firewood, this device is very handy to determine optimum moisture content levels before stocking my woodshed with our winter supply.
    The price was reasonable and it still works like new, 3 yrs after purchase.
    7 people found this helpful
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  • Reviewed in the United States on March 28, 2025
    Pattern Name: Digital Moisture MeterVerified Purchase
    Very good quality for the price point. Worked well on sheetrock areas
    One person found this helpful
    Report
  • Reviewed in the United States on January 16, 2025
    Pattern Name: Digital Moisture MeterVerified Purchase
    I purchased this to check recent water damage in my house and it worked well but the tips seem fairly delicate. I ended up also purchasing a moisture meter from Klein that read from the surface rather than probes that needed to be pushed into the piece you're checking. Since the General Meter was accurate and did work I went ahead and kept it also. I gave it 4 stars instead of 5 due to the probe tips.
    10 people found this helpful
    Report
  • Reviewed in the United States on March 24, 2025
    Pattern Name: Digital Moisture MeterVerified Purchase
    Reliable. If anyone buys firewood from a supplier this is definitely needed to test the dryness of the wood before they dump it. If firewood is to green to burn it can easily be sent back. I got stuck with 2 cords of wood that needed another 18 month to season. If I had this I would never accepted the delivery.
  • Reviewed in the United States on January 2, 2025
    Pattern Name: Digital Moisture MeterVerified Purchase
    I worked pest control for 4 years and was in thousands of crawlspaces in that time. I always had this meter with me to get moisture readings in the subfloor system while doing termite inspections and just general crawlspace inspections for moisture mitigation. This meter can take a beating over time and still keep on working. Extremely good on battery life as well. It may not give you the range of information that other meters out there can, but it's simple and it does exactly what it's supposed to. It always seemed to be accurate as well, when compared to similar models from other brands that co-workers used.
    21 people found this helpful
    Report
  • Reviewed in the United States on March 6, 2025
    Pattern Name: Digital Moisture MeterVerified Purchase
    We had some roof leaks and needed to check where they were to air them out. This moisture sensor was reasonably priced and worked very well. As you can see in the picture, it will light up red when there is substantial moisture in your walls. Very happy with the product and would recommend (not happy about my roof leaks!).
    Customer image
    5.0 out of 5 stars
    Moisture sensor was reasonably priced and worked very well

    Reviewed in the United States on March 6, 2025
    We had some roof leaks and needed to check where they were to air them out. This moisture sensor was reasonably priced and worked very well. As you can see in the picture, it will light up red when there is substantial moisture in your walls. Very happy with the product and would recommend (not happy about my roof leaks!).
    Images in this review
    Customer image
    6 people found this helpful
    Report
  • Reviewed in the United States on April 18, 2024
    Pattern Name: Digital Moisture MeterVerified Purchase
    The General Tools MMD4E Digital Moisture Meter is an indispensable tool for anyone dealing with moisture-related issues. From the moment I started using it, I was impressed by its accuracy and ease of use. Whether I'm checking for water damage in walls, floors, or ceilings, this moisture meter provides precise readings with just the press of a button.

    What sets the MMD4E apart is its versatility and reliability. It features a wide moisture detection range, allowing me to accurately assess moisture levels in various materials, from wood and drywall to concrete and plaster. Plus, its compact size and ergonomic design make it comfortable to hold and use for extended periods.

    Overall, the General Tools MMD4E Digital Moisture Meter is a must-have tool for contractors, homeowners, and DIY enthusiasts alike. Its accuracy, versatility, and ease of use make it an invaluable asset for identifying and addressing moisture issues quickly and effectively. I highly recommend it to anyone in need of a reliable moisture meter.
    24 people found this helpful
    Report
  • Reviewed in the United States on June 4, 2013
    Pattern Name: Digital Moisture MeterVerified Purchase
    I recently noticed a small crack in my ceiling that has a large brown outline around it. The brown outline is clearly water damage, but while the crack is definitely new, I cannot tell if the water damage has always been there or not. I bought this device to help me to determine if I need to call in a professional.

    The product arrived today, as expected. It was in its retail packaging, which is a clamshell. You'll need scissors to open it up. A 9v battery was also inside the clamshell. I'm not sure why the change, but I'm really happy that companies are now including batteries with their toys.

    So I took the meter out of the packaging and put in the battery. No screws to take out or anything. The battery cover just clips back on.

    The device couldn't be much easier to use. There are only 3 buttons..
    1. Power. Hold this to turn the moisture meter on and off
    2. Mode. Press this to switch between wood and "construction material" mode.
    3. Lock/Sound. Press this toggle "lock" of the display in case you want the percent to stay on the screen. Hold this to toggle whether or not the device beeps (you probably don't want it to beep).

    I'd be testing my drywall ceiling, so I put the moisture meter into "construction material" mode. I was hoping I wouldn't need to jam it into my ceiling to see the results, so I first tested a part of the ceiling I knew did not have a leak. The meter read about 3%. I moved over to the brown spot and pressed the needles against the ceiling (I didn't push in) and, depending on where I was along the brown spot, the reading ranged from about 2%-6%. According to the guide on the back of the device (which is great), this means my ceiling is not very moist. Obviously that was good news.

    Then I started to worry that the device would not function right if it wasn't fully pushed into the ceiling. I really did not want to put holes in the ceiling, but I figured that in the best case, I'd need to paint over the brown spot anyway, so two little holes couldn't hurt. So I jammed the needles into the ceiling in a few places and getting a consistent reading was not easy. In a few of the spots, the percentage changed from between 1%-2%, then from 7%-10% and back again. I wasn't moving the meter -- it just could not decide the moisture level. Now, I understand the science behind the device (at least I think I do), so I get that I could have been moving it a little or maybe I was there was some movement within the ceiling so the circuit was not continuously completed.. I'm really not sure. I tried a few different places in the ceiling, and in the end, I have slightly more confidence that there is not a leak on the ceiling, but I am not sure about it. Hopefully if there was a leak, the device would be more decisive in telling me about the moisture.

    Overall, I think I'm happy about the purchase, but only because I got a little extra confidence for $30, which is probably less than I would have paid an "expert" to come and check it out. If you're a home inspector or contractor who will be charging people for your use of a moisture meter, I would look into the more expensive options, but for a homeowner who does not want to pay $100+ for a device you'll probably use 2-3 times in your lifetime, this one will give you a little more information than you currently have.

    In summary, very easy to use, but I'm not completely confident in its ability to give reliable results.
    36 people found this helpful
    Report

Top reviews from other countries

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  • Samarth
    5.0 out of 5 stars Good product
    Reviewed in India on August 23, 2019
    Pattern Name: Digital Moisture MeterVerified Purchase
    Super product. It is actually worth when you see it perform accurately and reliably. Sound and light indications for medium and high moisture levels. It is value for money if measuring moisture is critical in your application
  • Mukuka Mubanga
    5.0 out of 5 stars Simple and easy to use
    Reviewed in the United Kingdom on April 6, 2022
    Pattern Name: Digital Moisture MeterVerified Purchase
    Easy to use with timber
  • MAI
    1.0 out of 5 stars Bad product
    Reviewed in the United Arab Emirates on April 7, 2025
    Pattern Name: Digital Moisture MeterVerified Purchase
    The item was received in bad condition. It’s clear that the wrapping had been opened before it was sent to me. It appears as though someone used it and then rewrapped it—poorly.
  • Vossi
    4.0 out of 5 stars Funktion super Beschreibung miess
    Reviewed in Germany on December 30, 2013
    Pattern Name: Digital Moisture MeterVerified Purchase
    Die Funktion ist einfach und gut ablesbar, doch eine Beschreibung ohne deutsch ist schlecht zu gebrauchen.
    Das gesamte Ergebnis ist aber gut.
    Report
  • Freakinoldguy
    5.0 out of 5 stars Well worth the money
    Reviewed in Canada on March 27, 2018
    Pattern Name: Digital Moisture MeterVerified Purchase
    This tool saved me a ton of money. I had a flood and when the restoration company assured me that it hadn't gone under the subfloor in the kitchen I got suspicious. So, I bought this item and took a reading. Well it showed excessive moisture under the subfloor. Then I called the company and told them what the moisture reading was they immediately sent another estimator who confirmed my suspicions. Besides as a bonus once the project manager found out I had a moisture meter there was no more of the "it should be dry" excuses because I'd go with him and take my own readings. LOL.

    Living on the wet coast this is a great tool for any homeowner and I've used it pretty much everywhere in my home including the attic. It may not be perfectly accurate but it's definitely accurate enough to let you know if you have problems so they don't become major issues. So I'd definitely recommend this tool for anyone who wants a cheap effective way to check moisture in building materials and burnable wood.