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 Digital Moisture Meter Mmd4E

General Tools Digital Moisture Meter Mmd4E

Product ID: 159485749

Details

Battery Description
No batteries
Brand
General Tools
Manufacturer
General Tools
Mounting Type
Tabletop
Voltage
9 Volts

📊Pin-type precision sensing

📱Clear LCD readout

🔋Battery-free operation

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€ 125.10

Duties & taxes included

In stock

Sold byAmazon AustriaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

📏 Measure moisture like a pro—because precision never goes out of style!

PINPOINT ACCURACY - Get exact moisture readings with advanced pin-type sensors for flawless diagnostics.
COMPACT PORTABLE - Lightweight design fits perfectly in your toolkit—carry confidence wherever you go.
ZERO BATTERY HASSLE - Operates without batteries—always ready when you are, no downtime or replacements needed.
INSTANT DIGITAL DISPLAY - Crystal-clear LCD screen delivers quick, easy-to-read moisture levels on the spot.
TRUSTED INDUSTRY STANDARD - Backed by 14,589+ reviews and a 4.5-star rating, it’s the go-to tool for pros.

The General Tools Digital Moisture Meter MMD4E is a professional-grade pin-type moisture meter featuring a clear LCD display and battery-free operation. Highly rated by thousands of users, it delivers precise, instant moisture readings ideal for home improvement and professional use.

Specifications

ASIN	B00275F5O2
Battery Description	No batteries required
Best Sellers Rank	#109,414 in Home Improvement ( See Top 100 in Home Improvement ) #104 in Moisture Meters
Brand	General Tools
Brand Name	General Tools
Country of Origin	USA
Customer Reviews	4.5 out of 5 stars 14,644 Reviews
Global Trade Identification Number	00681035414477, 00885265551395
Manufacturer	General Tools
Model Number	MMD4E
Mounting Type	Tabletop
Part Number	MMD4E
UPC	012301860924 716080037835 885312937219 885265551395 885367884865 681035414477 069060294668 031112659039 885898031110 522536779064 971483008299 031113382226 UPC 012301860924 716080037835 885312937219 885265551395 885367884865 681035414477 069060294668 031112659039 885898031110 522536779064 971483008299 031113382226 See more
Unit Count	1 Count
Voltage	9 Volts

Reviews

P**T

Good product

It's the best from all th meters available in market

14.12.2021

A**R

Carry case

A protective carry case is needed

18.09.2019

I**D

Nice product

Very good equipment

26.10.2019

P**.

Meets expectations

26.12.2019

@**D

Display gone after 1use. Dont buy.

I used it once now its half display is not showing digits. No i find amazon is not taking strict action on its sellers. I loosing faith on amazon & its sellers.

24.06.2021

A**M

DONT BUY - Not a quality product, stopped working in few days, Selling not responding

STOPPED WORKING IN FEW DAYS. COULD NOT GET REPLACEMENT SINCE THE SELLER IS NOT RESPONDING. BEWARE OF THIS SELLER

19.01.2021

A**A

All is OK

All is OK item is good to fulfill our requirements we can purchase more this type of other equipment's in future but rate is high

20.09.2021

M**A

Simple and easy to use

Easy to use with timber

6.04.2022

S**D

Seems quite accurate and well made for the price

I bought this gauge mostly to check if firewood is dry enough to use in our wood heater. It works great for that purpose, but it seems the manufacturer designed it to show if construction materials are dry enough to use without risk of mold occurring. I expect it would work well for that as it is easy to use and easy to read the display. An added bonus in this price range is the calibration contacts in the cap. You can check it before you use it, to make sure it is reading accurately.

13.02.2021

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

A**S

Excelente

Excelente artículo y servicio. Muy fácil de usar.

29.03.2019

G**!

Great little gadget

Bought this for my husband so he can check firewood moisture levels.

23.09.2023

Common Questions

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Yes, all products are sourced directly from authorized retailers in the US, UK, UAE and India. We maintain strict quality control processes and verify each product before shipping. All items come with applicable manufacturer warranties and are covered by our standard return policy.

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Trustpilot

TrustScore 4.5 | 7,300+ reviews

Neha S.

Excellent communication throughout the order process. Product is perfect.

2 weeks ago

Yusuf A.

Fantastic experience overall. Will recommend to friends and family.

1 month ago

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