General Plastic LED Digital Moisture Detector

Article #01215202 Model #MMD4E
General Plastic LED Digital Moisture Detector


The General® detector locates and verifies humidity and detects problematic humidity levels. Check moisture in hard and softwood, concrete, gypsum and carpets. It features LED digital indicators from 8% to 22% and is backed by a 1-year limited warranty.

  • Measures water content of wood and building materials with 3% accuracy and 0.1% resolution
  • Helpful in new home inspections and home restoration, locating roof leaks or in selecting dry lumber at the yard
  • Helps ensure appropriate levels of surface dryness before painting, sealing, or treating wood or drywall
  • Overall measurement range of 5 to 50% for wood and 1.5 to 33% for building materials
  • Separate low, medium, and high scales, icons and tones for wood and building materials
  • Built-in low battery indicator for energy conservation
  • Powered by 9-volt battery (included)

Technical specifications

Works with iOS :No Works with Android :No Wi-Fi Compatibility :No Weight(lbs.) :5 Weight(kg) :2.268 Warranty :1-year Type :Moisture meter AC Voltage :N/A Amperage :25000000 App Compatibility :No Application :Detects hidden leaks in wood, plaster and carpet, provides accurate moisture level readings and is great for new home inspections, locating roof leaks or even selecting dry lumber at the yard Battery Included :Yes Bluetooth Compatibility :No Case Included :No Color/Finish Family :Gray DC Polarity Indicator :No DC Voltage :9 Display Type :Digital Non-Contact :No Series Name :N/A Set/Individual :Individual Sub Type :N/A Sub-Brand :N/A

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what model is it

Asked by: tommy021
Answered by: Scooter 250
Date published: 2019-02-02

What range of moisture can be meadured?

Asked by: Plumber Al
5 to 50% for wood,1.5 to 33% for building material wood moisture scales 5 to 11.9% low, 12 to 5.9% med 16 to 50% high building material scales 1.5 to 16.9% low,17 to 19.9% med,20 to 33% high
Answered by: Diane Hewitt
Date published: 2019-04-03

How do I check the moister level on concrete?

Asked by: Meir

Is 15% a lot for particle board?

Asked by: Scooter 250
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General Plastic LED Digital Moisture Detector is rated 4.3 out of 5 by 127.
Rated 5 out of 5 by from Bowl Turner I needed another meter for my lathe work and did not want to spend a lot of money. I turn rough bowls out of green wood and need to know when I can finish them. This meter seems to do the job. I've tested the accuracy and it is very close to expensive moisture meters. Well worth the money.
Date published: 2017-07-06
Rated 4 out of 5 by from Good, basic, inexpensive meter I bought this meter to test wall moisture in basement walls while shopping for a new home. While I can't vouch for the absolute accuracy of the meter's readings, I can say that this model is easy to use and gave what appeared to be accurate and consistent readings. This meter also has LED lights that register whether the material's moisture levels are low, medium, or high. This was a very handy feature when taking reading in locations where it was hard to see the screen. General tools also provides two replacement pins for the meter, but there is no place on or in the meter to store these extra pins. So I have taped my extra pins inside the cap with Gorilla Tape which seems to be doing just fine. I would have given this meter 5 stars if they had a storage compartment for the replacement pins and if the base of the unit was designed to hold the cap while you are using the meter. Other than that, I am very satisfied with this product.
Date published: 2016-11-04
Rated 5 out of 5 by from Good and Consistent Moisture Meter I had this tool for about a month now. I purchased it because I suspected that a recent home purchase had some unresolved moisture issues that were affecting the laminate wood floors and drywall. Its done a good job of alerting if moisture is low, med or high as well as displaying the moisture reading. It also has a little calibration feature built into the cap that allows me to see if its still calibrated. Tool also comes with a extra set of meter pins incase the installed ones wear out. I'm glad I purchased this tool, I think it works well.
Date published: 2021-01-07
Rated 4 out of 5 by from Moisture Meter I purchased this meter about a month ago to use on a State of Michigan project. This meter is very easy to use on both gypwalls and blockwalls as well. The product was more then worth the money that I spent for it. I would suggest anyone who is the need for a meter to purchase this one, you could certainly spend more, but I see no need to do so.
Date published: 2011-01-25
Rated 5 out of 5 by from Can't beat it for the money Did the job - needed to confirm my fence was ready for painting - worked great
Date published: 2011-08-10
Rated 4 out of 5 by from ok only had it for 2 weeks I had a lot of walnut cut into boards so I purchased this to keep track of the moisture content of the boards. It seems to work good and easy to use
Date published: 2016-08-16
Rated 4 out of 5 by from A good purchase I bought this to read moisture levels in woods like pine, poplar, and maple. It works well: easy to use and seems to be very accurate. You should make it a point to read the operating instructions.
Date published: 2015-07-05
Rated 5 out of 5 by from Moisture meter Great product! Anyone who cuts or burns firewood needs one of these meters. You can tell how seasoned the wood is in seconds! No more green wood smoldering in the wood stove!
Date published: 2012-01-30
Rated 5 out of 5 by from Great Moisture Meter-Great Price@Lowe's We had a water leak up stairs and the downstairs celeing paint began to pop lose and peel off. This meter helped fine the source of the leak. Great price better product. Way tyo go Lowe's.
Date published: 2011-07-06
Rated 4 out of 5 by from Good moisture meter. I've never used any others but this one seems reliable. The pins are VERY easy to bend so be careful testing hardwoods. The power button has to be held firmly for over 5 seconds before the unit will turn on, I thought the meter was broken when I first got it because I didn't think I'd have to hold the power for so long... Overall very pleased though.
Date published: 2013-01-06
Rated 5 out of 5 by from BIG BANG FOR LITTLE BUCKS I purchased this item to check for a leaking upstairs drain. When I first looked at all of the moisture meters some of them were $100 +. This unit did the job with no problem. It was eay to use and well constructed. I highly recommend it if you are checking drywall for saturation.
Date published: 2011-06-01
Rated 5 out of 5 by from Moisture Detector Excellent device. With all the flooding in Texas we definitely needed a unit like this. It not only senses the moisture level in various materials, but also allows you to hold the reading for a few seconds when you are trying to read in a hard to reach area where all you can get is your hand and the measuring unit.
Date published: 2017-09-22
Rated 5 out of 5 by from Helped find seasoned wood [This review was collected as part of a promotion.] I have been having trouble with purchasing firewood. They all claim to be seasoned, buying this inexpensive tool solved the problem, I was instantly able to check a delivery and turned down a couple as they were well over 20% moisture. Now I can easily start fires that burn efficiently and heat my home.
Date published: 2019-11-26
Rated 4 out of 5 by from Good product I purchased this meter to test the moisture in my home after being flooded by hurricane Harvey. Very good meter for the cost. Would recommend this meter to anyone in need of this type of instrument.
Date published: 2017-09-22
Rated 5 out of 5 by from digital moisture meter [This review was collected as part of a promotion.] works great! really helps to pinpoint moisture problem areas. I was concerned at first with having to use the pins to stick the walls and wood area. I was afraid I would be leaving noticeable holes in the walls but it is a small probe about the size of a straight pin and the holes are not noticeable. Great product and easy to use. Even comes with an extra set of probes. Only improvement would be to include a canvas pouch or carrying case to store it in or a compartment to hold the extra set of probes.
Date published: 2018-11-04
Rated 5 out of 5 by from Good buy! first time user of moisture meters, this is simple to operate, easy to read , except in low light situations, clear instructions, love the design especially the protection of needle probes, great value for the money, I think they must be very much in demand by people who make furniture using especially those using rough lumber. The only con I feel is no light for certain situations, even so I would buy another one tomorrow.
Date published: 2014-02-23
Rated 4 out of 5 by from I wonder if it is accurate The meter seems to be designed for home maintenance -- checking for location of leaks etc. I bought mine to measure moisture in wood prior to steam bending. It does read in % but I don't know how accurate that is. I will take it to a lumber yard and compare its readings to those of the $300 meter the yard uses. As long as I know what number my meter reads on wood they measure at 20%, my needs are met - cheaply. It is easy to use and seems durable.
Date published: 2011-09-30
Rated 5 out of 5 by from Good value, does what it should [This review was collected as part of a promotion.] I had some cherry and apple felled and wanted to be sure that the wood was ready to be turned or slabbed. This meter gives me instant readings as to the moisture content within the wood. It is super easy to use. Remove the cap & point protectors, turn it on and press it to the wood. The moisture meter also has a calibrating resistor built into the cap, so you can be certain of the measurements. The LEDs on the front will also indicate whether the moisture content is Low, High or Ok. It has two modes of operation, one for wood (the reason I bought it) and one for "building materials". The building materials setting can help trace roof or plumbing leaks in drywall or flooring. Just probe the building material in several locations, the higher the moisture content, the closer to the source of the leak.
Date published: 2018-10-12
Rated 5 out of 5 by from A must have for flood damaged homes [This review was collected as part of a promotion.] Love it - able to check moisture levels in walls without cutting sheetrock. tells us where to replace insulation and/or sheetrock. Takes the guesswork out of the areas
Date published: 2018-10-25
Rated 5 out of 5 by from Great find!! Purchased this Moisture Meter after my flat flooded. What a nightmare! This is a great meter at an affordable price! The meter works right out of the package and is easy to read and interpret. The readings were close to the professional version the abatement folks had, within 1-2% just as the the directions indicate. I've been monitoring the moisture levels daily and am happy to see things drying out. I can see this will be a useful thing to keep in my tool box!
Date published: 2020-10-06
Rated 5 out of 5 by from For the price, Why would you buy anything else. The Moisture Meter is easy to use. Seems to be very accurate. You can go out and spend a lot more money on a moisture meter that provides the same result but why would you. For the price I paid for this one, I can buy 3 for the price I would pay for the other brands. Love it!
Date published: 2015-07-15
Rated 5 out of 5 by from best price for a really good product I shopped around and Lowe's had the best price. It's sturdy and compact. Just what I needed.
Date published: 2011-11-22
Rated 5 out of 5 by from fantastic product This moisture meter is super easy to use. I have used several that are 8x the price and none have been as easy to carry in your pocket and use.
Date published: 2014-07-05
Rated 5 out of 5 by from A must have with a EPA airtight stove I bought a new EPA air tight Wood stove and all the information about them agree that if the chimney is right and your firewood is between 15 to 20% it will be the best thing you have ever owned. If the wood is above 20% your chimney will build up creasote and half the BTU from the firewood would be used to dry out the wood enough to burn or will not burn at all.These new stoves burn wood gas not steam. So the moisture in the firewood is a big deal to me. The way my rows are stacked I had to reach way back between two rows as far as my arm would reach and stick the wood, then I pressed the hold button then pulled it out to see my reading. Now I know my firewood is 15% moisture . I have read it takes one year ,two years to season out firewood and I was worried because it has been 3 months, I am not worried anymore because I have this LCD Moisture Meter , not a cricket in a match box or a dark wooly worm .It uses a 9 volt normal battery which is included . it does have a beeping sound that gets faster the more moisture there is . I felt it was slow to turn on and turn off, you need to hold the button down for a bit and wait, no big deal now I know. It does shut it self off after 3 minutes of no use. The sharp probe pins are replaceable . I read a lot of reviews and knew I would not be happy with most of the others.
Date published: 2014-09-05
Rated 4 out of 5 by from Water mitigation This moisture meter worked great! We bought it after a water leak to monitor our drying. It worked well on wood and drywall. It is easy to use. I would definitely recommend it for other home owners.
Date published: 2014-08-27
Rated 5 out of 5 by from Detected roof leak This device helped me prove to my roofer that I had a leak. I'm glad I bought it.
Date published: 2021-08-01
Rated 5 out of 5 by from Works as good as the high end units. Wish it came with a box, made my own.
Date published: 2012-07-02
Rated 3 out of 5 by from Moisture meter This is the only moisture meter Lowes offers. It comes with an extra set of probes, but there is no place to store them so they will likely get lost. The hold function is a bit hard to manipulate when the meter is in a not so convenient spot. Good value for the money however.
Date published: 2015-08-16
Rated 1 out of 5 by from Dead right out of box Couldn’t get it to provide any readings. Put pins into variety of materials, and it did nothing. Funny it passed the calibration test. Will get another, it’s the right price.
Date published: 2017-12-09
Rated 5 out of 5 by from Works as advertised [This review was collected as part of a promotion.] I use this to test the moisture level of my lumber to determine when to seal or paint. Saves much more time then waiting a long period of time and hoping the lumber is dry enough. This is a must have if you have to do a lot of painting or sealing new wood constructions.
Date published: 2019-05-02
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