Model # MO210

Internet #203449681

Extech Instruments Wood/Building Material Pocket Moisture Meter

Extech Instruments

Wood/Building Material Pocket Moisture Meter

  • Dual settings for wood and other building materials
  • Fashioned with digital LCD readout and analog barograph
  • Includes 3 CR-2032 coin-style batteries
$8230 /each
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Frequently Bought Together

Product Overview

The Pocket Moisture Meter from Extech allows you to quickly assess whether wood and other porous materials have endured any water incursion. Simply push the sharply pointed electrode pins into the surface of sheetrock, drywall, wallboard, concrete, mortar, plaster or other building materials and the device will detect moisture levels between 0.2% to 2.4%. Slide the material-selection switch to wood and the handheld meter will determine moisture presence in timber from 6% to 44%.

  • A must-have tool for water mitigation specialists and insurance adjusters
  • Use to detect moisture in wood, wallboard, drywall, sheetrock, cardboard, plaster, concrete and mortar
  • Outfitted with replaceable threaded measurement electrode pins (9.5 mm length)
  • Constructed with impact-proof plastic housing
  • Protective cap has built-in nodes for battery check and measurement verification test
  • Automatically shuts off after 15 minutes of inactivity
  • Includes belt clip
  • Click here for more information on Electronic Recycling Programs

Info & Guides

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Product Depth (in.)
Product Height (in.)
Product Width (in.)


Control Type
Display Type
External Electrode
Not Supported
Backlit,Interchangeable Pins/Probes
Maximum Moisture Reading (%)
Maximum Sense Depth (in.)
Measureable Materials
Wood and Building Materials
Minimum moisture reading (%)
Product Weight (lb.)
Test Meter Type
Moisture Meter
Tools Product Type
Test Meter

Warranty / Certifications

Manufacturer Warranty
1 Year

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Customer Questions & Answers

What's a good reading on wood

What is a good reading on wood and ceramic tile
Asked by: tony
14-15 is dry standard for wood. It also depends on what part of the country you are in. Here in Utah it's dry.
Answered by: Jarvis
Date published: 2016-10-23

I need to order 109 meters

Will this be a backorder item since I need to order 109 moisture meters? Can I have them delivered all at the same time? Can I get a bulk discount? Thank you much Art
Asked by: GK
Hi GK, this item is currently in stock online. The will allow you to place the order for whatever quantity is available at the time in the online inventory but will not allow you to place an order for more than what inventory is stocked online. The merchandise will ship if available in accordance with the vendor's procedures and can ship in different shipments depending on the size of the order. Additionally, we do not offer bulk discounts for online orders at this time and unless otherwise labeled on the product. We appreciate your business and look forward to serving you in the future. Thank you for shopping Home Depot.
Answered by: THDSupport
Date published: 2015-12-16
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Customer Reviews

Wood/Building Material Pocket Moisture Meter is rated 4.3 out of 5 by 12.
Rated 5 out of 5 by from Excellent Design and Construction. Couldn’t be Quicker or Easier to Use I’m going to start with my thoughts on this meter in case that’s all you care about, but afterwards I’m going to share my thoughts and struggles with moisture reading in general, because I think my experience can help. I love the design and construction. It's well-sized. To turn the meter on you simply remove the cap. No button needed. Pop the cap off and take a reading. Pop the cap back on and you're done – the meter turns off. But there's even more to the cap than this neat trick and I think it’s quite an innovative solution. Embedded in the cap are two resistors and two sets of contacts. To be clear, this is a resistive meter, which means it works by passing a small current through and measuring the resistance of the material, which is simply compared to known readings of Douglass fir. It’s a specialized ohm meter. If you meter one set of contacts you can check the battery life. Measure across the other set and you get a reading that should be within a small range mentioned in the instructions that indicates that the meter is calibrated. I can tell you that there are meters out there that require expensive resistors to check the calibration, but this meter includes it. For me, I couldn't care less about the digital bar graph because I'm happy with the absolute value. But it doesn't take away from the meter, either. It’s supposed to give you a more visual relative positioning on a scale. The sole switch on the meter is used to change the range, similar to a digital multi-meter. Building materials, such as Sheetrock, are much drier than lumber and therefore need a smaller scale. For example, Sheetrock might be 1.5% versus 10% lumber. They could have made the meter smarter, IMO so the switch wouldn’t be necessary but it’s definitely not an issue at all. My one complaint is the choice of batteries. This takes 3 CR-2032, which are large watch type batteries. I'd prefer AAA, but I will say that you can get a 5 pack for less than $5. How can I be sure that the meter is accurate? I cannot. I can tell you that it has given me consistent readings on various lumber pieces that I’ve been using for the past few weeks. I’ve compared these readings to those from another meter that I’m currently reviewing. Unfortunately (and expectedly) they do not agree. As with this meter, the other has been consistent. I’m going to talk about what this means to me and what I think it could mean to you below. I will say, however, that I trust this meter’s readings more than the other’s based on a hunch, but I could be wrong. See below for why I don’t think it’s all that important, though. In closing, I can absolutely recommend this meter, especially if you’re looking for something that’s portable for a job site. When I chose the meter for review I actually expected it to be inferior to the more expensive one that I chose at the same time. Assuming you don’t need the pinless mode that some meters offer (see below) I wouldn’t hesitate to recommend this meter. I rated the Value as Good only because the price is on par with similar offerings from other manufacturers. ### ON MEASURING MOISTURE IN LUMBER ### As a woodworking hobbyist I've wanted a moisture meter for some time now. Unfortunately, I've been unable to pull the trigger on a specific meter, strangled by specs, reviews and most likely way too much over-thinking. I was excited about the opportunity to try two meters from The Home Depot and finally get see for myself. If you’re looking for a moisture meter you’re surely expecting to find one that gives accurate readings. I read your mind, didn’t I? I know, not really. But, with meters ranging from $30 to $600 how much do you need to spend to get accuracy? I’d be lying if I could answer that question and it’s the reason I simply couldn’t make a decision on which one to buy. I even had a couple of models in my hands at two different stores and walked away. Once purchased, how would I even know if it’s accurate? I’ve read quite a bit on measuring lumber moisture content and it’s not as straightforward as I had assumed. There are factors that override the reading on a given piece of lumber regardless of the meter. Lumber temperature, your region’s relative humidity and the wood species, for instance. Regardless of the reading you need to adjust that value using various charts that you can find online. Some meters come with charts and some actually let you choose the wood species for automatic adjustment. There are two types of wood meters. Resistive and electromagnetic wave technology. Resistive meters use pins that you press into the lumber or even drive in with a hammer. Electromagnetic meters are pinless – you simply pass them over the material and they react to changes in the capacitance of the material, which is affected my moisture content. Pin meters let you spot check moisture. If you use it on a wet spot you’ll get a skewed result. Likewise if the core of a thick piece is wetter than the outside and you’re using shallow pins. A pinless meter would let you see the bigger picture, supposedly reading up to four inches deep into the material. Also, a pinless meter might be your only option if you simply can’t make holes in the test piece. The more I read the more I suspect that the absolute reading isn't as important as I'd think. Regardless, if a given meter provides consistent readings you can make your decisions on a relative basis. For me, I think my approach will be to use some reference lumber of various species for comparison with new test pieces. This is why I think the actual reading isn’t important. If I know it’s the same as my reference material, close to it, or twice the reading I’ve got a pretty good idea on how dry the test piece is. Considering I tend to work with a half dozen species mostly, having reference pieces is a non-issue for me. I don’t think I’m allowed to include links here, but I found a great article on WoodshopNews titled “The Goldilocks rule of wood moisture” that brings together a lot of information on metering lumber. You can find it by googling that title. Also, search for wood species specific gravity charts, which will tell how to convert a given reading to the “actual” number, based on the wood species. I was surprised by how much it can differ, but again, if you use reference pieces for relative readings this wouldn’t matter. For me, I think my goal isn’t to know the number of a test piece, but rather whether it’s dry enough for my project. Perhaps a fine furniture maker or one who dries their own lumber might have different needs. Finally, I read about a tip on protecting your meters tips when reading dense lumber. Drive two nails into the lumber and simply read across them. I love that idea.
Date published: 2014-09-10
Rated 4 out of 5 by from Easy to use, easy to read This product helped me detect moisture in an area that I wasn't sure if I needed to replace a 2x4 that looked fine but had water damage. It is very user friendly. The controls are more than simple in that there is only a toggle between wood products and building material (drywall in my case). There is no on/off switch. It has a button on top that turns itself on when you remove protective cap off protruding nodes that physically need pressed into the material to be measured. My only complaint is the batteries seem to die quickly. And it uses three 3 volt disc type batteries which I paid $8 a pair for at ace. I am satisfied with my purchase. The bar graph helps with reading relative percentages. I am anxious to try it on firewood to check and see if it is seasoned and to check to see if wood is dry to work for woodworking. Instructions don't indicate reading levels because different species of wood read differently. What I found is that drywall needs to be below 1% humidity on building materials scale and pine studs need to be less than 11% on wood scale to be considered safe. I spoke with a mold consultant and was informed that mold growth could potentially begin around 16% humidity and above 60 degrees I hope this helps whoever is looking for a moisture meter.
Date published: 2014-04-01
Rated 1 out of 5 by from Wish it worked like the first one. Stay away unless you have time to keep exchanging this item. The first one I bought worked great for about 3 months and then stopped working. so I bought another one and that one didn't work, I exchanged it and the next one did the same thing. I ended up with 4 non working meters since the store I was getting them doesn't sell them anymore and don't know if they'll be restocked again. Long story short, I wouldn't recommend this product to anyone I know but you may get lucky and get 1 that "might" work.
Date published: 2015-10-29
Rated 4 out of 5 by from Simple Effective Moisture Meter OVERALL: Simple. Auto off on putting cover on is nice. LED is easy to read in most lights, back-lit would be nice. Reasonable accurate in my tests of wood moisture levels. FUNCTIONALITY: Just environmental moisture and wood, nothing fancy. Two pins must be stuck into surface to read, so may not be ideal for every application, but it works it you are willing. BODY: Very solid. I have a couple Extech tools, and have been happy with them, this one seems no exception. Fairly ergonomic and top stays on well, requiring a little pressure to sides to remove.
Date published: 2014-09-09
Rated 5 out of 5 by from Great tool for finding moisture in walls I had the opportunity to evaluate this handy tool. I have been using it to locate moist areas behind walls without the need to tear anything apart during home inspections. It works on many materials. The LCD and bar graph display is quite nice. It has a nice belt clip and is easy to find ( orange and green) when you set it down. It comes with several replaceable pin probes. If your proud of a job done right then be 100% sure future will not hold moisture problems that could have been avoided had you used this tool
Date published: 2014-09-10
Rated 4 out of 5 by from Simple to use and handy to check if you have moisture issue I got this to check if wood was dry enough before trying to make something from it. It does give you the moisture content and I have to assume it's correct. I don't have anything to compare it too. It's easy to use, just take off the cap and it turns on, it's a nice feature. Then just press the tips into a piece of wood and it gives a reading. In the cap there is a couple of test points one for checking the calibration and one to check the battery. It also comes with a few extra tips, I guess they wear out. If I get the chance I will check to see if its readings match that of other moisture meters. I also have used to the check if there is any moisture issues in the lower level of my home by checking the moisture reading in the drywall of the rooms I am doing some work on to see if I problems before moving on to finishing the space off.
Date published: 2014-08-29
Rated 4 out of 5 by from Don't loose the cap. This meter will check both wood and building material. So it is handy for checking lumber in the wood shop, as well as checking thing like drywall for water damage. I like that the cap protects the probes, and the ease of use. As far as I can tell, it is accurate. (I don't have another one to compare the reading with.) The down side is that if you loose the cap, you can no longer turn the unit off. The meter automatically turns off when you remove the cap. The cap also contains contacts and circuitry that lets you test the meter and batteries. This is an interesting feature. The meter features replaceable probes, and comes with extra probes. This is handy after you have done enough tests to dull the probes. It will be interesting to see how long they last when checking plaster. All in all, I am happy with the meter. It is easy to use, and has nice features.
Date published: 2014-08-29
Rated 5 out of 5 by from Fast and easy to use I was having moisture damage issues in one of my bathrooms but couldn't figure out what was old staining and what was new. This made short work of finding the moisture and saving me from having to cut and patch multiple holes in the drywall to find the leak. What a time saver! I was pleasantly surprised how many spare electrodes they put in the package, they should last my lifetime.
Date published: 2014-08-26
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