Manufacturer | GE Lighting |
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Part Number | MMD4E |
Item Weight | 5.3 ounces |
Product Dimensions | 5.55 x 9.5 x 1.4 inches |
Country of Origin | China |
Item model number | MMD4E |
Batteries | 1 Product Specific batteries required. (included) |
Is Discontinued By Manufacturer | No |
Size | Pin Type |
Color | Grays |
Style | Digital Pin Type, Visual & Audible Alerts |
Pattern | Digital Moisture Meter |
Shape | Drywall |
Power Source | Battery Powered |
Voltage | 9 Volts |
Item Package Quantity | 1 |
Measurement System | Metric |
Mounting Type | Surface Mount |
Usage | Inside; Amateur, Inside; Professional |
Included Components | Moisture meter, batteries, extra pins |
Batteries Included? | Yes |
Batteries Required? | Yes |
Battery Cell Type | Zinc Carbon |
Warranty Description | 1 Year |
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To see product details, add this item to your cart.
FREE Returns
Return this item for free
Free returns are available for the shipping address you chose. You can return the item for any reason in new and unused condition: no shipping charges
Learn more about free returns. How to return the item? - Go to your orders and start the return
- Select the return method
- Ship it!
Ships from: Amazon Sold by: Amazon Warehouse
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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
Return this item for free
Free returns are available for the shipping address you chose. You can return the item for any reason in new and unused condition: no shipping charges
Learn more about free returns.- Go to your orders and start the return
- Select the return method
- Ship it!
Return this item for free
Free returns are available for the shipping address you chose. You can return the item for any reason in new and unused condition: no shipping charges
Learn more about free returns.- Go to your orders and start the return
- Select the return method
- Ship it!
Return this item for free
Free returns are available for the shipping address you chose. You can return the item for any reason in new and unused condition: no shipping charges
Learn more about free returns.- Go to your orders and start the return
- Select the return method
- Ship it!
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.
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Product guides and documents
From the brand
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Innovative Product Development
We provide craftspeople and artisans with a broad assortment of specialized tools to enhance productivity and inspire creativity.
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From the manufacturer
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Pinpoint AccuracyPin meters find moisture spots more quickly and accurately than pinless meters that can only test broad, flat surfaces |
Replaceable PinsEasily replace any bent or curled pins with the PIN3 replacement pins |
Easy to Read LED ScreenIncludes a hold button to freeze and hold readings |
MMD4E | MMD7NP | MMD950 | MM8 | RHMG650 | Replacement Pins for MMD4E & RHMG650 | |
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Customer Reviews |
4.5 out of 5 stars
13,507
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4.4 out of 5 stars
4,322
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4.4 out of 5 stars
257
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4.4 out of 5 stars
4,322
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4.1 out of 5 stars
55
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4.4 out of 5 stars
268
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Deep Read Pins | ✓ | ✓ | ✓ | ✓ | ||
Deep Sensing Probe | ✓ | |||||
Pinless | ✓ | ✓ | ✓ | ✓ | ||
Measures Moisture | ✓ | ✓ | ✓ | ✓ | ✓ | |
Backlit LED Display | ✓ | ✓ | ✓ | ✓ | ✓ |
Product information
Technical Details
Additional Information
ASIN | B00275F5O2 |
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Customer Reviews |
4.5 out of 5 stars |
Best Sellers Rank | #899 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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Videos
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1:08
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Demo & Review of General Tools Moisture Meter!
Sammie Finds
Videos for this product
1:16
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My experience with the General Tools Moisture Meter
Matt
Videos for this product
1:03
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Great Tester for Multiple Surfaces!
Ballin' Under Budget
Videos for this product
1:07
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HONEST Review Of The General Moisture Meter
✅ The Glitzy Pear
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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This Item 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 | Recommendations | dummy | dummy | dummy | dummy | |
Try again! Added to Cart | Try again! Added to Cart | Try again! Added to Cart | Try again! Added to Cart | Try again! Added to Cart | Try again! Added to Cart | |
Price | -41% $29.34$29.34 List: $49.95 | $26.99$26.99 | -16% $48.90$48.90 Typical price: $58.90 | $11.95$11.95 | $29.95$29.95 | -10% $64.00$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
9 volts
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Customer reviews
Customer Reviews, including Product Star Ratings help customers to learn more about the product and decide whether it is the right product for them.
To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyzed reviews to verify trustworthiness.
Learn more how customers reviews work on AmazonCustomers 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
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
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
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
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
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
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
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
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
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As far as we know, it works great. We aren't too concerned with the overall accuracy of the instrument, +/- 3% is just fine for us as we're looking to compare the difference between two materials in our home (assuming the error is consistent between those readings). The resolution of the meter is 0.1%.
Other things you might want to know:
- It comes with it's own 9v battery.
- It measures wood between 5 - 50% and 1.5 - 33% for other building materials.
- It has a hold feature which allows you to save the current reading so you don't have to keep the meter jammed in the material you are measuring.
- It beeps to let you know when it is done measuring. (Although, you can turn this off. We did accidentally and then figured out how to put it back on. We don't know why, but it has 8 different tones from which you can select.)
- It has a toggle button between measuring wood and concrete (or other building materials).
- The instruction manual is easy to read and follow. They come in English, French, and Spanish.
- It uses a two pin system to measure the electrical resistance of the material between the two pins. This is then calibrated against moisture content to give you the reading as a percentage. This means that it will make two small pin holes in the wood you are trying to measure. Therefore, if you are concerned about the holes, consider a "pinless" moisture meter, which are much more expensive.
The instruction manual lists other uses such as testing the moisture content of powders (for any scientists out there who need to measure such things for making standard solutions from scratch) and to test the dryness of a wall or furniture before painting or finishing. It also shows instructions for how to track down a leak using the meter. There's a funny picture in the instructions with the caption "be careful not to hurt your hands on the pins." Although, I did "test" the moisture content of my husband's leg. Don't worry, I didn't draw blood.
Overall, for the price, the features, and the product functionality (so far), I would say this is a great buy. Also, we got it shipped quickly via Amazon.com. It arrived two days after we purchased it. Yay!
UPDATE (7/31/2010): The pins broke when we were testing some brazilian walnut - one of the hardest woods out there. But I read in the instruction manual that pins were replaceable. I emailed General Tools through their website and got a quick email back. Less than a week later, I had two new prongs FOR FREE in my mailbox. Customer Service was AMAZING! The replacement prongs are much better than the ones that came with the meter. The new ones are shaped like little cones and have worked great on the harder woods.
I will state here that I did not read all of the reviews, but I read enough of them to decide upon this item.
These are my technical observations for those who may have doubts reading some of the other reviews. I wondered about the battery life, so I made some checks. Using my Heathkit IM-2215 digital multimeter, I found that the current draw in the on (no measuring) position using the 200 ma scale, was a steady 5.8 ma. Using the lowest scale of 2 ma, the current draw was 5.8 ma with a fluctuating least significant digit (LSD). In the off position, using the lowest 2 ma scale, I note a current draw of .000 ma. So, my dear friends, if there is any current draw, it would have to be in the micro-ampere range. It probably draws less than my digital clock in the car! I am not worried about the battery life. If you doubt these studies, let me inform you that I have been a licensed radio amateur since 1962. Trust me, I know what I'm doing.
Depending on the species of wood, most woods (previously kiln dried) will absorb in a humid environment, in the neighborhood of no more than 13 to 14 % moisture. I got this information from my local lumber producer. I looked at numbers worked out with a formula.
I found that interesting, so I probed some timbers down cellar in this nearly 100 year old home. Wood posts and floor joists showed some variation, but in general were 13 to 14 % moisture in my cellar having a humidity level of 80 to 90 percent. My highest joist readings were 15.9 and 16.0 per cent. I have one of those Acu-rite digital devices on the cement floor. The temperature was 61 degrees. The upstairs humidity is currently running at 58 %, which is not ideal. I have been considering a dehumidifier.
I hope this information allays any fears you may have purchasing the MMD4E moisture meter. I love it!
Side note - this thing does leave 1mm-ish puncture wounds in materials. It is probably something that paint would span and cover (no drywall repair required), but the holes are noticeable.