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.

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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

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

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: 253296938

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Details

Colour
Gray
Brand
General Tools
Product dimensions
24.1W x 3.6H
Battery description
Alkaline
Lower temperature rating
32 Degrees

📊0.3" backlit LCD digits for instant readings

📍8mm stainless steel pins for precise moisture detection

🔔Audible & visual alerts for high-medium-low moisture levels

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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Klein Tools ET140 Pinless Moisture Meter for Non-Destructive Moisture Detection in Drywall, Wood, and Masonry; Detects up to 3/4-Inch Below Surface

Description

💧 Stay ahead of mold with precision you can trust!

SMART ALERTS SYSTEM - Visual and audible notifications keep you informed of moisture severity at a glance.
COMPLETE READY TO USE KIT - Includes extra pins, protective calibration cap, and 9V battery for immediate deployment.
PRECISION PIN TYPE SENSOR - Stainless steel pins penetrate surfaces for accurate readings in wood, drywall, and concrete.
INSTANT MOLD RISK DETECTION - Quickly identify moisture levels to protect your home and health.
USER FRIENDLY BACKLIT DISPLAY - Large 0.3" digits with backlight ensure easy reading even in dim spaces.

The General Tools MMD4E Digital Moisture Meter is a professional-grade pin-type moisture tester designed for quick, accurate detection of moisture in wood, drywall, and concrete. Featuring a large backlit LCD, stainless steel pins, and audible/visual alerts, it empowers homeowners and professionals to prevent mold and water damage effectively. The kit comes complete with extra pins, a calibration cap, and a 9V battery, making it ready for immediate use.

Specifications

Manufacturer	General Tools
Part number	MMD4E
Item Weight	150 g
Product Dimensions	14.1 x 24.13 x 3.56 cm; 150 g
Batteries	1 Product Specific batteries required. (included)
Item model number	MMD4E
Size	Pin Type
Color	Gray
Style	Digital Pin Type, Visual & Audible Alerts
Material	Wood
Pattern	Digital Moisture Meter
Shape	Drywall
Power source type	Battery Powered
Voltage	9 Volts
Item Package Quantity	1
Measurement System	Metric
Plug Profile	Tabletop
Specific uses	Inside; Amateur, Inside; Professional
Included components	Moisture meter, batteries, extra pins
Batteries Included?	Yes
Batteries Required?	Yes
tech_spec_battery_description_toys	Alkaline

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?

Reviews

4.5

All from verified purchases

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.

7.04.2025

B**M

It’s working great

Only issue is the pins they bend fast when used on wood

2.02.2022

A**A

No functioning properly

Not functioning properly

26.12.2022

N**R

wonderfull

i used this devise in my house it showed me the cause that was a leak inside the wall

22.01.2023

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TrustScore 4.5 | 7,300+ reviews

Abdullah B.

Great price for an authentic product. Fast international shipping too!

3 weeks ago

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The MOLLE sheath is of exceptional quality. Very happy with my purchase.

2 weeks ago

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TrustScore 4.5 | 7,300+ reviews

Neha S.

Excellent communication throughout the order process. Product is perfect.

2 weeks ago

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Customer service was outstanding when I had questions about the product.

2 days ago

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