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General Tools MMD5NP Moisture Meter, Pinless, Digital LCD

4.2 out of 5 stars 753 customer reviews
| 102 answered questions

List Price: $89.99
Price: $42.77 & FREE Shipping on orders over $49. Details
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Digital LCD Pinless Type
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  • Enables moisture measurement of a variety of materials without having to pierce the material's surface
  • Has a range of 0.0 to 99.9% WME for wood, 0.0 to 56.5% WME for building materials, and measures up to a depth of 3/4 in
  • Sports a Jumbo LCD display with intuitive on-screen icons for low/medium/high moisture content, and wood/concrete mode
  • Includes audible peak reading alert
  • Displays low and very low battery warnings
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Product Description

Style: Digital LCD Pinless Type

Product Description

The wide-range MMD5NP enables moisture measurement of a variety of materials without having to pierce the material's surface. The unit has a range of 0.0 to 99.9% WME for wood, and 0.0 to 56.5% WME for building materials, and measures up to a depth of _ in. It sports a Jumbo LCD display with intuitive on-screen icons for low/medium/ high moisture content, and wood/concrete mode.

From the Manufacturer

The wide range MMD5NP enables moisture measurement of a variety of materials without having to pierce the material's surface. The unit has a range of 0.0 to 99.9-percent WME for wood, and 0.0 to 56.5-percent WME for building materials, and measures up to a depth of 3/4-inch. It features a jumbo LCD display with intuitive on-screen icons for low and medium and high moisture content as well as a wood and concrete mode.

Product Information

Style:Digital LCD Pinless Type

Technical Details

Part Number MMD5NP
Item Weight 6.9 ounces
Product Dimensions 1.4 x 6.2 x 10.2 inches
California residents Click here for Proposition 65 warning
Item model number MMD5NP
Size Pinless
Style Digital LCD Pinless Type
Item Package Quantity 1
Certification No
Batteries Included? Yes
Batteries Required? Yes
Warranty Description 1 year parts

Additional Information

ASIN B001CXG7H4
Customer Reviews
4.2 out of 5 stars 753 customer reviews

4.2 out of 5 stars
Best Sellers Rank #29,318 in Home Improvements (See top 100)
#16 in Industrial & Scientific > Industrial Electrical > Sensors > Temperature Sensors
#19 in Industrial & Scientific > Test, Measure & Inspect > Temperature & Humidity > Humidity & Moisture Meters
#2,243 in Home Improvement > Contractor Supply
Shipping Weight 10.4 ounces (View shipping rates and policies)
Date First Available December 13, 2006

Warranty & Support

Warranty, Parts:Parts
Manufacturer’s warranty can be requested from customer service. Click here to make a request to customer service.

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From the Manufacturer

General Tools & Instruments MM1E Moisture Meter, Pin Type, LED Bar Graph General Tools & Instruments MMD4E Moisture Meter, Pin Type, Digital LCD General Tools & Instruments MMD3E Pin Type Digital Moisture Meter General Tools & Instruments MMD5NP Moisture Meter, Pinless, Digital LCD General Tools & Instruments MMD7NP Moisture Meter, Pinless, Digital LCD with Tricolor Bar Graph General Tools & Instruments MMD950 Moisture Meter, Pin Type or Pinless, Deep Sensing with Sensor and
Model Number MM1E MMD4E MMD3E MMD5NP MMD7NP MMD950
Measurement Depth Mostly surface Mostly surface Mostly surface 3/4 in. (20mm) 3/4 in. (20mm) Mostly surface for pins and remote pin-type probe; 4 in. (102mm) for pinless sensor
Pin Length 3/8 in. (10mm) 3/8 in. (10mm) 3/8 in. (10mm) N/A N/A 3/16 in. (5mm)
Measurement Accuracy ±1% of reading ±3% of reading ±2% of full-scale range ±(3% of reading + 3 digits) ±4% of reading for wood ±(3% of reading +5 digits)
Measurement Resolution 1% 0.1% 0.1% 0.1% 1% 0.1%
Material Selection Switch? No No
Calibration Check Manual No Manual No Automatic Manual and Auto
Other Key Features Data hold, Lo/Med/Hi level tones & icons Data hold, Lo/Med/Hi level LEDs & tones Data hold, Audible peak reading alert Hi/Lo audible alarms, Hi/Med/Lo color bands Data hold, Audible/visual moisture level alarm
What comes with it? (User's manual and 1 year Limited Warranty) 9V Battery, User's manual and 1 year Limited Warranty 9V Battery, User's manual and 1 year Limited Warranty User's manual and 1 year Limited Warranty 9V Battery, User's manual and 1 year Limited Warranty 9V Battery, User's manual and 1 year Limited Warranty 9V Battery, hard case, external probe, 2 Pairs of extra pins, User's manual and 1 year Limited Warranty

Customer Questions & Answers

Customer Reviews

Top Customer Reviews

Style Name: Digital LCD Pin Type Verified Purchase
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.
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Style Name: Digital LCD Pinless Type Verified Purchase
I was excited to receive this moisture meter, as I had a set of resawn walnut boards to check for uneven moisture content on the inside and outside faces. My excitement turned to mild concern when I started to read the instructions: "Press either button to active the sensor". OK, I can roll with that, I guess, although a later item, "Buzzer sounds when the reading changes every increasing digit" left me somewhat bemused. Funnily enough, the instructions also included a disclaimer: "Notice: we are not responsible for typographical errors". Um, OK, then who is responsible?

Anyway, I "actived" the sensor, pressed it as described to one of my boards and...got a reading of 59.9% (the maximum). "Hmm", I thought, "those boards have been drying for two years - that can't be right." So, I tried a piece of beech, nice and dry when I bought it, that's been in my shop for a year or so, planed mirror smooth and thus eliminating the chance that a rough surface could be the problem, and got a reading of 8.0%. "That's more like it!", I thought, "Maybe my first attempt was a just a fluke." Then I re-measured the beech that had given me a believable reading. This time, I got 14%. Another attempt netted me 29%, then 7.4%. So, I tried a few other pieces of wood, with similarly wildly varying results. Fooling around with the unit, I found that pressing more on one corner or the other would cause huge swings in the reported measurement. When I held it in my left hand, I got a different result than when I held it in my right hand. Five minutes later, it was back in its box and on its way to the Amazon returns department.

Maybe this was just a defective unit. Who knows?
3 Comments 110 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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Style Name: Digital LCD Pin Type Verified Purchase
I bought the General Tools MMD4E Digital Moisture Meter to check the moisture of some flooring and trim moulding for house I am building. At the price of this product, I don't expect much in the way of absolute accuracy. Instead what I want is relative accuracy. In other words, I don't care if the wood has 8% or 10% moisture content. What I want to see is, what does the wood do over time. Once the reading stops dropping, the wood has mostly gotten as dry as it is likely to get in its present location. I tested the meter by taking a variety of readings to see if I could reproduce a giving reading. I went from dry wood to wet and back to dry. It seemed to be able to reproduce readings with a reasonable reliability.

The meter has a peculiarity that I think is responsible for another reviewer thinking his meter was broken, resulting in a 1-star rating. If the meter has not been turned on for a while, you have to hold down the on/off button for 4-5 seconds to turn the unit on. I've used a number of products which require you to hold down the power button for a prolonged period to prevent turning it on accidentally, but nothing as long as this meter. To make matters worse, the documentation says nothing about this feature. I can easily see why some people might think their meter is broken. A strange twist on the on/off is that if you turn the meter off, then turn in right back on again, you only have to push the power button for about a second for it to turn back on.

I rated this 4-stars because of the accuracy Vs resolution of the display. Why do they have a display with a resolution of 0.01% on a meter with an accuracy of +/- 3%? In trying to reproduce the same reading multiple times I typically saw +/- 0.5%. Realistically the meter should not display readings to a tenth.
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