Does it sense moisture through a painted surface or just the moisture content of the paint?

It senses moisture through a painted surface.

Can this be used on concrete and drywall?

Yes, the device has four modes. Wall, masonry, soft wood, hard wood. Wall is drywall.

Can this be used to locate a leak behind drywall. The drywall is not showing wetness so the water is probably running down a stud or outside wall.

This tool will measure the moisture content of any building material including wood and drywall. If the test indicates a high moisture content in just one spot, you could probably conclude that there was a leak at that point.

Will this unit work on a plywood sub floor, and hardwood flooring to verify the hardwood has properly aclimated for installation?

In order to get accurate readings you will need to make sure the two prongs on the top make contact with the area you wish to measure for moisture. The two prongs are pretty small and the tips are sharp. I was able to obtain readings on wet drywall, plywood and ceramic floor tile. As long as contact was made with the points it worked for me and the price is reasonable.

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Pinless Moisture Meter

Product ID: 29722681

Details

Battery Description
Alkaline
Brand
General Tools
Color
White
Item Weight
0.34 Pounds
Product Dimensions
2.8"W x 6.3"H

💡Backlit 2" LCD with 3-color LED alerts

📏Measures moisture up to 3/4" deep

🔕Pinless, non-invasive sensing tech

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476 zł

Duties & taxes included

In stock

Sold byAmazon PolandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Details

Battery Description
Alkaline
Brand
General Tools
Color
White

Description

💧 Stay ahead of leaks—measure smarter, protect better!

EARLY MOLD PREVENTION - Detect leaks early with out-of-range and low battery alerts to protect your space
ERGONOMIC INTUITIVE - Comfort grip with auto-calibrating, easy-to-read backlit LCD digits
INSTANT VISUAL ALERTS - 3-color LED bar graph plus audible alarms for no-guesswork moisture levels
MULTI MATERIAL MASTERY - Tailored settings for drywall, masonry, softwood, and hardwood accuracy
PRECISION MOISTURE DETECTION - Pinless tech reads up to 19mm deep without damaging surfaces

The General Tools LCD Moisture Meter MM8 is a professional-grade, pinless moisture detector designed for precise, non-invasive readings up to 3/4" deep in wood and building materials. Featuring a high-visibility backlit LCD, 3-color LED alerts, and ergonomic design, it offers tailored settings for drywall, masonry, softwood, and hardwood. Ideal for early leak detection and mold prevention, this tool empowers DIYers and pros alike to safeguard their spaces with confidence.

Specifications

ASIN	B01BLXVDFA
Battery Description	Alkaline
Best Sellers Rank	#67,600 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #22 in Moisture Meters
Brand	General Tools
Brand Name	General Tools
Color	White
Customer Reviews	4.4 out of 5 stars 869 Reviews
Global Trade Identification Number	00681035017340
Included Components	Console^Battery (1)
Item Dimensions W x H	2.8"W x 6.3"H
Item Type Name	---
Item Weight	5.44 ounces
Lower Temperature Rating	32 Degrees Fahrenheit
LowerTemperature Range	32 Degrees Fahrenheit
Manufacturer	General Tools
Model	MM8
Mounting Type	Surface Mount
Operating Humidity	5% to 95%
Part Number	MM8
Product Dimensions	2.8"W x 6.3"H
Smart Home Compatibility	Not Smart Home Compatible
UPC	735090905002 681035017340
Unit Count	1.0 Count
Upper Temperature Range	104 Degrees Fahrenheit
Voltage	9 Volts

Reviews

C**N

18.11.2022

C**N

18.11.2025

V**J

28.01.2026

S**K

21.06.2025

K**.

1.10.2025

I**K

8.02.2025

N**N

25.07.2025

****

30.11.2025

K**T

7.03.2023

A**A

27.02.2023

J**Z

24.01.2026

K**S

3.06.2025

A**R

20.11.2022

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