








💧 Detect moisture before it detects you – stay mold-free and damage-proof!
The General Tools MMD4E Digital Moisture Meter is a professional-grade pin-type moisture tester designed for quick, accurate detection of moisture levels in wood, drywall, and concrete. Featuring a backlit LCD with large digits and audible/visual alerts, it empowers homeowners and professionals to identify water leaks and prevent mold growth early. Equipped with durable stainless steel pins, a calibration cap, and powered by a 9V battery, this compact, lightweight tool is a must-have for maintaining safe, dry environments.






| ASIN | B00275F5O2 |
| ASIN | B00275F5O2 |
| Batteries | 1 Product Specific batteries required. (included) |
| Batteries | 1 Product Specific batteries required. (included) |
| Batteries Included? | Yes |
| Batteries Required? | Yes |
| Best Sellers Rank | #622 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #1 in Moisture Meters |
| Color | Gray |
| Country of origin | China |
| Customer Reviews | 4.5 4.5 out of 5 stars (14,488) |
| Customer reviews | 4.5 4.5 out of 5 stars (14,488) |
| Date First Available | 11 August 2012 |
| Date First Available | 11 August 2012 |
| Department | Unisex Adult |
| Included components | Moisture meter, batteries, extra pins |
| Is Discontinued By Manufacturer | No |
| Item Package Quantity | 1 |
| Item Weight | 159 g |
| Item model number | MMD4E |
| Item model number | MMD4E |
| Manufacturer | General Tools |
| Manufacturer | General Tools |
| Material | Wood |
| Measurement System | Metric |
| Part number | MMD4E |
| Pattern | Digital Moisture Meter |
| Plug Profile | Tabletop |
| Power source type | Battery Powered |
| Product Dimensions | 14.1 x 24.13 x 3.56 cm; 159 g |
| Product Dimensions | 14.1 x 24.13 x 3.56 cm; 159 g |
| Shape | Drywall |
| Size | Pin Type |
| Specific uses | Inside; Amateur, Inside; Professional |
| Style | Digital Pin Type, Visual & Audible Alerts |
| Voltage | 9 Volts |
| tech_spec_battery_description_toys | Alkaline |
A**E
Very good
Very useful and we found something not new damage in the wall we can’t see it but with this we discover it .
S**I
شكرا
M**I
Bad product
The item was received in bad condition. It’s clear that the wrapping had been opened before it was sent to me. It appears as though someone used it and then rewrapped it—poorly.
B**M
It’s working great
Only issue is the pins they bend fast when used on wood
A**A
No functioning properly
Not functioning properly
N**R
wonderfull
i used this devise in my house it showed me the cause that was a leak inside the wall
P**T
It's the best from all th meters available in market
H**I
We were getting hardwood floors installed - or so we thought - when the installers notified us that they could not do the installation because the wood in our house had acclimated to 6.4% moisture and our subfloors were at 12.8% moisture. The installer found a leak in our water softener line which we got fixed the next day. Unfortunately, we had no way of knowing (ourselves) when to call the installer back. Hence, we purchased this meter. 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.
M**A
Easy to use with timber
V**I
Die Funktion ist einfach und gut ablesbar, doch eine Beschreibung ohne deutsch ist schlecht zu gebrauchen. Das gesamte Ergebnis ist aber gut.
A**R
A protective carry case is needed
Trustpilot
2 days ago
3 weeks ago