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.

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.

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.

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.

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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

Product ID: 253296938

Details

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

📊0.3" backlit LCD digits

📍8mm stainless steel pins

🔔Audible & visual moisture alerts

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₪400

Duties & taxes included

In stock

Sold byAmazon IsraelDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔍 Detect moisture like a pro — don’t let hidden leaks catch you off guard!

DURABLE READY TO USE - Includes extra stainless steel pins, protective calibration cap, and 9V battery for immediate deployment.
TRUSTED INDUSTRY LEADER - From General Tools, a brand synonymous with precision and reliability in professional-grade tools.
MOLD PREVENTION MADE SIMPLE - Quickly assess moisture levels to safeguard your home and health from black mold risks.
PRECISION MOISTURE DETECTION - Pin-type sensor with 5-50% wood & 1.5-33% drywall range for pinpoint accuracy.
INSTANT VISUAL AUDIBLE ALERTS - Backlit LCD with high-medium-low moisture indicators keeps you ahead of hidden damage.

The General Tools MMD4E Digital Moisture Meter is a professional-grade pin-type moisture tester featuring a large backlit LCD with 0.3" digits, audible and visual alerts for moisture levels, and durable 8mm stainless steel pins. It accurately measures moisture in wood (5-50%) and building materials like drywall (1.5-33%), helping you detect water leaks and prevent mold growth. Ready to use out of the box with included batteries and extra pins, it’s a trusted tool for home inspectors, contractors, and DIY enthusiasts aiming to protect their spaces from hidden water damage.

Specifications

ASIN	B00275F5O2
Battery Description	Alkaline
Battery description	Alkaline
Best Sellers Rank	#31,836 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #22 in Moisture Meters
Brand	General Tools
Brand Name	General Tools
Color	Gray
Colour	Gray
Country Of Origin	China
Customer Reviews	4.5 out of 5 stars 14,631 Reviews
Global Trade Identification Number	00681035414477, 00885265551395
Included Components	Moisture meter, batteries, extra pins
Item Dimensions W x H	24.1W x 3.6H centimeters
Item Type Name	Moisture Meter
Lower temperature rating	32 Degrees Fahrenheit
LowerTemperature Range	32 Degrees Fahrenheit
Manufacturer	General Tools
Model	MMD4E
Mounting Type	Tabletop
Mounting type	Tabletop
Operating Humidity	Varied
Part Number	MMD4E
Product dimensions	24.1W x 3.6H centimeters
Temperature Accuracy	3
Temperature Reading Accuracy	plus_minus_2_degrees_celsius
UPC	012301860924 716080037835 885312937219 885265551395 885367884865 681035414477 069060294668 031112659039 885898031110 522536779064 971483008299 031113382226
Unit Count	1 Count
Upper Temperature Range	60 Degrees Celsius
Voltage	9 Volts

Reviews

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 .

7.12.2025

S**I

مقص الاغنام لم يصلني ولم استلم المبلغ المدفوع

شكرا

11.12.2025

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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Trustpilot

TrustScore 4.5 | 7,300+ reviews

Vikram D.

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

2 weeks ago

Sneha T.

Received my product in pristine condition. Great service overall.

1 month ago

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Buy anything from 5,000+ international stores. One checkout price. No surprise fees. Join 2M+ shoppers on Desertcart.

₪400

Duties & taxes included

In stock

Sold byAmazon IsraelDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Israel.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Meera L.

Smooth transaction and product arrived in perfect condition.

3 weeks ago

Khalid Z.

Great experience from order to delivery. Highly recommended!

1 week ago

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