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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 4.5 out of 5 stars 14,143 ratings

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Digital Moisture Meter
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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
MMD4E MMD7NP MMD950 MM8 RHMG650 Replacement Pins for MMD4E & RHMG650
Customer Reviews
4.5 out of 5 stars
14,143
4.4 out of 5 stars
3,849
4.3 out of 5 stars
274
4.3 out of 5 stars
731
4.0 out of 5 stars
61
4.4 out of 5 stars
301
Price $29.80 $47.25 $201.21 $29.99 $199.08 $17.73
Deep Read Pins
Deep Sensing Probe
Pinless
Measures Moisture
Backlit LED Display

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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% $29.80
List:$49.95
$27.98-33% $9.34
List:$13.99
$29.99-5% $47.25
List:$49.99
-30% $13.95
List:$19.99
Delivery
Get it as soon as Monday, Jan 20
Get it as soon as Monday, Jan 20
Get it as soon as Wednesday, Jan 22
Get it as soon as Monday, Jan 20
Get it as soon as Monday, Jan 20
Get it as soon as Monday, Jan 20
Customer Ratings
Sold By
power source
battery quantity
upper temperature rate
operating humidity
mounting type

Important information

Bulb Voltage

9 volts

Customer reviews

4.5 out of 5 stars
14,143 global ratings

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Customers say

Customers find the humidity meter easy to use and produce consistent results. They find it simple to operate with a large backlit display and three-button operation. The meter is sensitive to surface moisture and balances moisture levels throughout woods. Many consider it a good value for money and say it saved them expense. While some customers appreciate the tool quality, others have concerns about the pin durability. There are mixed opinions on accuracy and build quality.

AI-generated from the text of customer reviews

1,034 customers mention "Functionality"877 positive157 negative

Customers like the humidity meter's functionality. It produces consistent results and is easy to use and read. Some find it a nice device, though some have certain concerns.

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

"...It was a great price and served the purpose well. Although there are no instructions, it was easy to find a quick instruction on YouTube...." Read more

"...For this purpose, the meter works well...." Read more

"...Some fluctuation when poking the exact same spots but does a pretty good job overall." Read more

630 customers mention "Ease of use"559 positive71 negative

Customers find the humidity meter easy to use. It fits well in their hands, has controls that are easy to access, and a good size display. They say it's simple to test woods with this tool, and it provides accurate readings quickly.

"...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

"Quick and easy to use, just turn it one and put the pins into the wood and it gives an instant reading...." Read more

"...It is very simple to use. The unit comes with protective sleeves on the pins, which I removed, but saved and replaced for storage...." Read more

"very easy to use and don't have to dink with it push it into the wood a little way and will give you the % and a light that lets you know the range..." Read more

450 customers mention "Moisture level"390 positive60 negative

Customers appreciate the moisture meter's ability to identify surface moisture. They say it's sensitive to damp areas and balanced the 11% moisture throughout cannabis buds. The meter will pick up damp areas, but some customers don't believe the numbers are absolute percentages. It takes the guesswork out of staining a new deck and is well-made.

"This tool has helped us measure our fire wood moisture content on many occasions and saved us from using too wet of wood in our stove. We love it!" Read more

"...Measures moisture in dry wall and wood. Very easy to use and read the display." Read more

"...That's where the moisture meter comes in, to determine if the moisture level is sufficient. For this purpose, the meter works well...." 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

423 customers mention "Value for money"366 positive57 negative

Customers appreciate the humidity meter's value for money. They say it's worth the price and saves them money.

"...It was a great price and served the purpose well. Although there are no instructions, it was easy to find a quick instruction on YouTube...." Read more

"The general tools Digital moisture meter is an excellent item for the price...." Read more

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

"This is a great product for the price. Amazon got this to me in a timely manner. My general reason for buying this item was to measure firewood...." Read more

320 customers mention "Tool quality"310 positive10 negative

Customers find the humidity meter useful for monitoring water damage in walls and ceilings. It's easy to use, has great features, and is accurate. The meter is simple with one page of instructions.

"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

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

"...This is a simple device and there is one page of instructions on the site however for inclusiveness sake the 'other languages' make up many more,..." Read more

405 customers mention "Accuracy"261 positive144 negative

Customers have varying experiences with the humidity meter's accuracy. Some find it accurate and easy to use, with a nice calibration feature. Others mention that the readings are not as accurate, but close and repeatable at the very least.

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

"...They both seem to be real close for readings. I like the calibration feature of the MMD4E, that's a plus for my money." 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

197 customers mention "Build quality"127 positive70 negative

Customers have different views on the humidity meter's build quality. Some find it reliable and trustworthy, saying it withstands handling without apparent damage. Others mention that the pins are fragile and need to be stabbed into hard woods to get a proper reading.

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

"...and I broke the bent pin almost immediately as they are thin and fragile...." Read more

"...What sets the MMD4E apart is its versatility and reliability...." Read more

"It is well made and takes the guess work out of staining a new deck. It is also great at letting you know if you have an active leak in your ceiling." Read more

131 customers mention "Pin durability"37 positive94 negative

Customers are dissatisfied with the humidity meter's pin durability. They mention the pins bend easily when pushed into hard wood, and break easily. The pins seem flimsy and prone to breaking.

"...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

Quality
5 out of 5 stars
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Top reviews from the United States

  • 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.
    3 people found this helpful
    Report
  • Reviewed in the United States on January 6, 2025
    Pattern Name: Digital Moisture MeterVerified Purchase
    This tool has helped us measure our fire wood moisture content on many occasions and saved us from using too wet of wood in our stove. We love it!
    3 people found this helpful
    Report
  • Reviewed in the United States on January 30, 2024
    Pattern Name: Digital Moisture MeterVerified Purchase
    Quick and easy to use, just turn it one and put the pins into the wood and it gives an instant reading. The only problem (and the only reason it gets 4 stars instead of 5) is there's no instructions or manual with it. 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, I wasn't sure if the meter was working. Now when I tested on a piece of firewood outside, it lit up like a Christmas tree so I knew it wasn't completely faulty. Once I found the manual online and figured out that this was, in fact, how it's supposed to work, all was well and good. Just a little inconvenient to not have that information included in the package. But now that I know how the thing works, I'm really happy with it and wish I'd bought one years ago!
    13 people found this helpful
    Report
  • Reviewed in the United States on September 3, 2024
    Pattern Name: Digital Moisture MeterVerified Purchase
    I bought this product to test the moisture level on a fence I wanted to stain. It was a great price and served the purpose well. Although there are no instructions, it was easy to find a quick instruction on YouTube. It is very simple to use. The unit comes with protective sleeves on the pins, which I removed, but saved and replaced for storage. A battery is also included so you are ready to go.
    5 people found this helpful
    Report
  • Reviewed in the United States on December 9, 2024
    Pattern Name: Digital Moisture MeterVerified Purchase
    very easy to use and don't have to dink with it push it into the wood a little way and will give you the % and a light that lets you know the range of dryness I use it daily now on all my wood bowls
    2 people found this helpful
    Report
  • Reviewed in the United States on December 6, 2024
    Pattern Name: Digital Moisture MeterVerified Purchase
    This has been very helpful in determining if a stain on the wall is from a leak. Measures moisture in dry wall and wood. Very easy to use and read the display.
    4 people found this helpful
    Report
  • Reviewed in the United States on April 27, 2011
    Pattern Name: Digital Moisture MeterVerified Purchase
    The general tools Digital moisture meter is an excellent item for the price. I bought it to test the moisture content of logs I obtained from a tree service to see if they were moist enough to use for growing mushrooms. By drilling holes in logs and inserting mushroom fungus (spawn) into the holes, mushrooms will grow from the logs for about five years. A 30% or higher moisture level is necessary for proper mushroom fungus growth in the wood.

    That's where the moisture meter comes in, to determine if the moisture level is sufficient. For this purpose, the meter works well. It should be noted, however, that readings will vary with the location on the log being probed with the two sharp prongs and how far and forcefully the prongs are inserted into the wood.

    It's not precisely accurate with every reading, but that's a function of the degree of penetration, the uniform force of insertion and the area tested (bark or bare ends). This meter would be also be great for determining the reciprocal of what I test for, namely, how dry is the wood for burning.

    Previously, I had to saw a small piece from each log (much work), weigh the piece with a precision scale, then dry the piece on low for 24 hours in the oven, then weigh again to determine the moisture content. Now I can do this in a few minutes!

    I recommend that, when using this meter, you push it into both ends of the logs AND in several spots in the bark with the same degree of force, and see if you get consistent results. Use the same force to push the pins, and try to get the same pin depth in each test spot in the wood.

    A friend used it to check the extent of moisture in his basement carpet after he had some seepage. He was able to identify what areas of the carpet that needed drying so he could focus his fans and heaters effectively. After drying a while, he used the meter to determine which areas were fully dry so he could move his fans and heaters.

    One final observation: Another reviewer complained about the meter not turning. My advice: READ THE DIRECTIONS. It takes about 4 seconds of holding the 'on' button down to turn the meter on or off. This is a battery saving feature.
    16 people found this helpful
    Report

Top reviews from other countries

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  • Monica Cardenas
    5.0 out of 5 stars Funciona muy bien
    Reviewed in Mexico on November 1, 2022
    Pattern Name: Digital Moisture MeterVerified Purchase
    Cumple su función a la perfección
  • 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
  • pulkit
    5.0 out of 5 stars Good product
    Reviewed in India on December 14, 2021
    Pattern Name: Digital Moisture MeterVerified Purchase
    It's the best from all th meters available in market
  • Great quality!
    5.0 out of 5 stars Great little gadget
    Reviewed in Australia on September 23, 2023
    Pattern Name: Digital Moisture MeterVerified Purchase
    Bought this for my husband so he can check firewood moisture levels.
  • 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.