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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 13,507 ratings

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Digital Moisture Meter

Purchase options and add-ons

Color Grays
Brand General Tools
Product Dimensions 9.5"W x 1.4"H
Mounting Type Surface Mount
Voltage 9 Volts

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.
See more product details

Customer ratings by feature

Easy to read
4.4 4.4
Easy to use
4.3 4.3
Accuracy
4.1 4.1

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$29.34
Get it as soon as Tuesday, Apr 2
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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

Replacement Pins

Large LED

Pinpoint Accuracy

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

Replaceable Pins

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

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
13,507
4.4 out of 5 stars
4,322
4.4 out of 5 stars
257
4.4 out of 5 stars
4,322
4.1 out of 5 stars
55
4.4 out of 5 stars
268
Deep Read Pins
Deep Sensing Probe
Pinless
Measures Moisture
Backlit LED Display

Product information

Technical Details

Additional Information

Warranty & Support

Amazon.com Return Policy:Amazon.com Voluntary 30-Day Return Guarantee: You can return many items you have purchased within 30 days following delivery of the item to you. Our Voluntary 30-Day Return Guarantee does not affect your legal right of withdrawal in any way. You can find out more about the exceptions and conditions here.
For warranty information about this product, please click here [PDF ]

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General

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

Whether you're a professional contractor or a conscientious home owner, General's ultra-sensitive Moisture Meters help you to easily detect hidden leaks in wood, concrete, plaster and carpet. Available as both analog and digital models, the Meters provide accurate moisture level readings and are great for new home inspections, locating roof leaks or even selecting dry lumber at the yard. 99.9 count LCD w/0.4 in. high digits. Wood/building materials selection switch. Low, Medium and High moisture sounds and on-screen icons. High accuracy and resolution. Data hold + auto power off + low battery indicator. Replaceable stainless steel pins (#PIND4E). Powered by "9V" battery (included)., Lot of 1

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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-41% $29.34
List:$49.95
$26.99-16% $48.90
Typical price:$58.90
$11.95$29.95-10% $64.00
Typical:$71.25
Delivery
Get it as soon as Tuesday, Apr 2
Get it as soon as Tuesday, Apr 2
Get it Apr 12 - 17
Get it as soon as Tuesday, Apr 2
Get it as soon as Tuesday, Apr 2
Get it as soon as Tuesday, Apr 2
Customer Ratings
Easy to read
4.4
4.6
5.0
4.8
4.7
4.6
Easy to use
4.3
4.4
5.0
4.6
4.8
4.6
Accuracy
4.1
4.2
4.6
4.5
4.5
4.2
Sold By
Amazon.com
Mecurate Instrument
Amazon Global Store UK
Giant Viking
PROSTER US
Amazon.com
power source
Battery Powered
Hand-operated
Battery Powered
battery quantity
1 product specific, 1 9v
2 aaa
1 unknown, 1 unknown
1 9v
1 9v
mounting type
Surface Mount
Wall Mount
Tabletop
Tabletop
Surface Mount, Wall Mount
Surface Mount, Wall Mount

Important information

Bulb Voltage

9 volts

Customer reviews

4.5 out of 5 stars
4.5 out of 5
13,507 global ratings

Customers say

Customers like the moisture meter for its clear indication of moisture content. They say it's an essential tool for measuring moisture in wood and useful to measure humidity. They also appreciate the accuracy and value of the product. Customers also find the instructions manual easy to read and follow. However, some customers have reported issues with the reading accuracy.

AI-generated from the text of customer reviews

1,042 customers mention837 positive205 negative

Customers like the performance of the moisture meter. For example, they say it works well, is great for general usage, and is a great tool to have around. The beeper for wet wood is helpful for quick checking and selecting the driest wood. Some mention that the meter comes with a good for initial testing but quickly died. Overall, customers are satisfied with the performance and recommend it to others.

"...It comes with it's own 9v battery.- It measures wood between 5 - 50% and 1.5 - 33% for other building materials.-..." Read more

"...As far as I can determine, it is very easy to operate, functions as stated, and I believe I made the correct choice for my purposes...." Read more

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

"Its great for testing firewood but if you want to test a piece of lumber like Walnut or Oak, you have to stab the wood extremely hard and hope you..." Read more

576 customers mention515 positive61 negative

Customers find the product easy to use, with an easy-to-read instruction manual. They also say the product is simple and self-explanatory as they use it. Additionally, customers describe the screen on the meter as very easy to read. Overall, they find it to be an excellent product.

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

"...As far as I can determine, it is very easy to operate, functions as stated, and I believe I made the correct choice for my purposes...." Read more

"...It looks like this is set up to be fairly basic and self-explanatory as you use it, but mine came with zero documentation that I could find...." Read more

"Accurate and very easy to use. Essential tools for measuring moisture in wood. Helped me to know when to stain my new wooden fence." Read more

367 customers mention316 positive51 negative

Customers like the value of the tool. They say it's well worth the price, saves them thousands of dollars, and works well for the price.

"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

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

"Price is right works good with a reasonable battery type" Read more

"...If you need one, the price is right, it meets the sellers description, it met my expectations and I LIKE IT...." Read more

289 customers mention243 positive46 negative

Customers like the moisture reading of the tool. For example, they mention it's easy to read, and the indication of moisture content is clear. They also say it'll do its job in correctly reading moisture, and is an essential tool for measuring moisture in wood. Customers also say the meter is useful to measure humidity and water leaks, and it'd be able to track the drying progress.

"Accurate and very easy to use. Essential tools for measuring moisture in wood. Helped me to know when to stain my new wooden fence." Read more

"...This moisture meter was very helpful in knowing the lumber was ready and it was really easy to use." Read more

"Useful to measure humidity and water leaks" 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

282 customers mention222 positive60 negative

Customers are satisfied with the accuracy of the moisture meter. They mention that it is very accurate, precise, and easy to use. Some appreciate the resolution of the display. Overall, most are happy with their purchase and recommend it to others.

"Accurate and very easy to use. Essential tools for measuring moisture in wood. Helped me to know when to stain my new wooden fence." Read more

"...between the wet wood and known kiln-dry wood, this meter seems to be quite accurate...." Read more

"...So, while i can't verify the accuracy of the meter, its readings are consistent and do make sense...." Read more

"...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..." Read more

242 customers mention143 positive99 negative

Customers are mixed about the quality of the tool. Some mention it has a decent build quality, is durable, and reliable, while others say that the pins seem to be a little flimsy and broke when they were testing some.

"...firewood , to test the moisture before i burn inside my house, very good product." Read more

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

"...Is 10 years too long a lifespan to expect? Dunno, but it was cheap, so whatever. Think I'll try something else this time." Read more

"...The device can withstand some real pressure to "insert" but don't twist or bend while inserting, the results are broken pins and no reading." Read more

64 customers mention28 positive36 negative

Customers are mixed about the battery life of the tool. Some mention that it has a battery saving feature, while others say that it depleted after half dozen uses.

"...The battery was already inserted and no instructions were included. Obviously, the unit was used, even though I paid for a new unit." Read more

"...Other things you might want to know:- It comes with it's own 9v battery.-..." Read more

"...Example, the power button turns it on but does not turn it off...." Read more

"...This is a battery saving feature." Read more

102 customers mention26 positive76 negative

Customers are dissatisfied with the reading accuracy of the moisture meter. They mention that the reading was zero in all cases, it wouldn't give a reading, and that getting a consistent reading was not easy. Some complain that the screen is very difficult to read in low light situations and that they have to press hard to get a good reading.

"...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

"...This was in the bathroom but the reading was a very dry one. Needed to check because the paint peeled off...." Read more

"...It seems to read accurately and quickly. I gave 4/5 stars because occasionally it seems to become non-responsive...." Read more

"...the needles into the ceiling in a few places and getting a consistent reading was not easy...." Read more

Vitally Needed And Useful
5 Stars
Vitally Needed And Useful
I needed this instrument because I had a waterbed leak. I needed to know if the walls suffered water intrusion so I didn't start a big project needlessly.After getting the instrument and testing the wall, It did indicate excessive moisture or otherwise water intrusion necessitating mitigation procedures.The device is simple to use, accurate and is when needed, is vitally important to have and use. If you need one, the price is right, it meets the sellers description, it met my expectations and I LIKE IT.Absolutely recommended!UPDATE: ***IMAGE*** In my image with holes, I'm pointing out one area that after drilling and placing my hand in it the wall, found it SATURATED. The instrument indicated where further interior wall exposure was unnecessary and where it was.
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Top reviews from the United States

Reviewed in the United States on July 13, 2010
Pattern Name: Digital Moisture MeterVerified Purchase
311 people found this helpful
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Reviewed in the United States on August 2, 2013
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Reviewed in the United States on June 5, 2021
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Reviewed in the United States on November 18, 2023
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Top reviews from other countries

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Tenere
5.0 out of 5 stars simple and easy , accurate...
Reviewed in Canada on October 15, 2023
Pattern Name: Digital Moisture MeterVerified Purchase
Monica Cardenas
5.0 out of 5 stars Funciona muy bien
Reviewed in Mexico on November 1, 2022
Pattern Name: Digital Moisture MeterVerified Purchase
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
pulkit
5.0 out of 5 stars Good product
Reviewed in India on December 14, 2021
Pattern Name: Digital Moisture MeterVerified Purchase
Great quality!
5.0 out of 5 stars Great little gadget
Reviewed in Australia on September 23, 2023
Pattern Name: Digital Moisture MeterVerified Purchase