I found the stated range of error to be ambiguous. It was stated as being within 3% of the reading. But the units of measure of the reading are themselves in percent.So I wrote the following to the manufacturer, asking if I had a reading of, say, 10% did that mean the range of error was 9.97 - 10.03% or 7 - 13%.This was their reply:The accuracy is ±(3% + 3 digits) as stated in the manual. To use your example, if the meter reads 10% then it is really between 7%-13%. The website will be updated accordingly. Thank you for bringing this to our attention and if there is anything else you have questions about, please feel free to contact us.

General Tools & Instruments MMD4E Pin-Type Lcd Moisture Meter

General Tools & Instruments MMD4E Pin-Type Lcd Moisture Meter

Q: Can I use this product to rule out a plumbing leak under my concrete bathroom floor. The outer bathroom wall is concrete & paint is bubbling.

It won't show thru the cement unless it is wet. Also is the wall an exterior wall & you could be getting moisture there. With the paint bubbling you do have a water problem from some where inside or out, but you could check with the tool on the inside in the wall real low next to the cement. It worked real well for my particular problem without tearing up the carpet to find my problem. Hope this helps.

Q: I have a wooden floor that is swelling little bit. I know I had a small water leak. Can this tool help me to check if there is moisture underneath?

ABSOLUTELY! This is just what you need, it tells you the exact moisture where the contacts touch the wood. There is a small button on the face right under the word GENERAL that allows you to pick wood or concrete. I use it on our Maple flooring in the summer to see where we are with water content.

Q: Will it measure moisture in drywall?

Yes. It has two features (1) Wood which I use on dry wall, wood, plastered walls, carpeting.. (2) Building material which I use on concrete floors, concrete blocks... I have found it works well on concrete and I can trace moisture in our basement floors which has helped to target where work needs to be done in outside grading. By the way I am a 78 year old woman and have had "fun" using this meter. Money well spent.

4.5/5

Product ID: 725684306

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Details

Brand
General Tools
Mounting Type
表面実装
Voltage
9 Volts
UPC
(function(f) {
Global Trade Identification Number

⚡Fast moisture detection

📏Pin-type precision sensing

📟Clear LCD readout

Frequently Bought Together

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

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Description

📊 Measure moisture like a pro—don’t let hidden dampness catch you off guard!

DURABLE BUILD - Rugged construction stands up to job site conditions, ensuring long-term performance.
VERSATILE USE - Ideal for wood, drywall, and other building materials—perfect for pros who demand reliability.
INSTANT READINGS - High-contrast LCD screen ensures quick, easy-to-read moisture levels on the spot.
PINPOINT ACCURACY - Advanced pin-type sensors deliver precise moisture readings right where you need them.
COMPACT PORTABLE - Lightweight design fits comfortably in your toolkit for on-the-go diagnostics.

The General Tools & Instruments MMD4E is a pin-type moisture meter featuring a clear LCD display for fast, accurate moisture detection in various materials. Designed for professionals, it combines precision sensing with portability and durability to help you maintain quality and prevent costly damage.

Specifications

Color	Gray
Brand	General Tools
Product Dimensions	9.5"W x 1.4"H
Battery Description	Alkaline
Lower Temperature Rating	32 Degrees Fahrenheit
Mounting Type	Surface Mount
Operating Humidity	Varied
Voltage	9 Volts
Manufacturer	General Tools
UPC	012301860924 716080037835 885312937219 885265551395 885367884865 681035414477 069060294668 031112659039 885898031110 522536779064 971483008299 031113382226
Global Trade Identification Number	00885265551395, 00681035414477
Part Number	MMD4E
Item Weight	5.3 ounces
Country of Origin	China
Item model number	MMD4E
Batteries	1 Product Specific batteries required. (included)
Is Discontinued By Manufacturer	No
Size	Pin Type
Style	Digital Pin Type, Visual & Audible Alerts
Pattern	Digital Moisture Meter
Shape	Drywall
Power Source	Battery Powered
Item Package Quantity	1
Measurement System	Metric
Usage	Inside; Amateur, Inside; Professional
Included Components	Moisture meter, batteries, extra pins
Batteries Included?	Yes
Batteries Required?	Yes
Battery Cell Type	Zinc Carbon
Description Pile	Alkaline
Warranty Description	1 Year

Have a Question? See What Others Asked

accuracy

Can I use this product to rule out a plumbing leak under my concrete bathroom floor. The outer bathroom wall is concrete & paint is bubbling.

I have a wooden floor that is swelling little bit. I know I had a small water leak. Can this tool help me to check if there is moisture underneath?

Will it measure moisture in drywall?

Common Questions

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