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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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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General Tools LCD Moisture Meter #MM8 - Leak and Humidity Detector - Pinless and Non-Invasive

General Tools LCD Moisture Meter #MM8 - Leak and Humidity Detector - Pinless and Non-Invasive

Product ID: 29722681

Details

Battery Description
Alkaline
Brand
General Tools
Color
White
Item Weight
5.44 ounces
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

₪260

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—because your space deserves precision and protection.

ERGONOMIC DURABLE - Lightweight 5.44 oz design with a comfortable grip keeps you measuring smarter, longer.
EARLY MOLD PREVENTION - Out-of-range alarms and audible alerts catch leaks before they escalate—stay ahead of costly repairs.
CRYSTAL CLEAR READINGS - 2-inch backlit LCD and tri-color LED bar graph ensure you never miss a critical moisture alert, day or night.
TAILORED MATERIAL SETTINGS - Custom modes for drywall, masonry, softwood, and hardwood deliver pinpoint accuracy for every surface.
PRECISION MOISTURE DETECTION - Pinless technology reads up to 3/4" deep without damaging surfaces—protect your projects and peace of mind.

The General Tools LCD Moisture Meter MM8 is a top-rated, pinless moisture detector designed for professionals and DIYers alike. Featuring a high-visibility backlit LCD, customizable settings for multiple materials, and non-invasive sensing technology, it delivers accurate moisture readings up to 3/4" deep. With audible and visual alerts, ergonomic design, and early leak detection capabilities, it’s the essential tool to prevent water damage and mold growth in any project.

Specifications

ASIN	B01BLXVDFA
Battery Description	Alkaline
Best Sellers Rank	#610 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #1 in Moisture Meters
Brand Name	General Tools
Color	White
Customer Reviews	4.4 4.4 out of 5 stars (888)
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
LowerTemperature Range	32 Degrees Fahrenheit
Manufacturer	General Tools
Model	MM8
Mounting Type	Surface Mount
Operating Humidity	5% to 95%
Part Number	MM8
UPC	735090905002 681035017340
Unit Count	1.0 Count
Upper Temperature Range	104 Degrees Fahrenheit
Voltage	9 Volts

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