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

Product ID: 284030739

Details

Battery description
Alkaline
Brand
General Tools
Colour
White
Item weight
0.34 Pounds
Product dimensions
7.4W x 7.1H

💡Backlit 2" LCD with 3-color LED alerts

📏Measures moisture up to 3/4" deep

🔋9V battery with low battery alert

€ 104.05

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Sold byAmazon BelgiumDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

💧 Stay ahead of leaks with precision you can trust!

PINLESS PRECISION - Non-invasive sensing protects surfaces while delivering accurate moisture readings up to 19mm deep.
EARLY MOLD PREVENTION - Detect hidden leaks and moisture early to stop mold before it starts—your proactive home defense tool.
ERGONOMIC INTUITIVE - Comfort-grip handle and large backlit LCD digits ensure effortless use and easy reading in any lighting.
MULTI MATERIAL MASTERY - Tailored settings for drywall, masonry, softwood, and hardwood let you measure with confidence across projects.
VISUAL AUDIBLE ALERTS - 3-color LED bar graph plus audible alarms keep you instantly informed of moisture levels and out-of-range conditions.

The General Tools MM8 is a pinless, non-invasive moisture meter designed for professionals and DIYers to accurately measure moisture content in wood and building materials. Featuring a large backlit LCD, 3-color LED alerts, ergonomic design, and multi-material settings, it detects moisture up to 3/4" deep without damaging surfaces. Powered by a 9V battery with low battery alerts, it helps prevent mold and water damage by providing early leak detection and reliable readings.

Specifications

ASIN	B01BLXVDFA
ASIN	B01BLXVDFA
Batteries	1 9V batteries required. (included)
Battery Description	Alkaline
Best Sellers Rank	#4,772 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #7 in Moisture Meters
Brand Name	General Tools
Color	White
Customer Reviews	4.3 4.3 out of 5 stars (875)
Customer reviews	4.3 4.3 out of 5 stars (875)
Date First Available	18 March 2016
Global Trade Identification Number	00681035017340
Included Components	Console^Battery (1)
Is Discontinued By Manufacturer	No
Item Dimensions W x H	7.4W x 7.1H centimeters
Item Type Name	Pinless Moisture Meter
Item Weight	154 g
Item model number	MM8
LowerTemperature Range	32 Degrees Fahrenheit
Manufacturer	General Tools
Manufacturer	General Tools
Model	MM8
Mounting Type	Freestanding
Number of Items	1
Operating Humidity	5% to 95%
Part Number	MM8
Product Dimensions	16 x 7.11 x 7.37 cm; 154.22 g
Temperature Accuracy	1.8
UPC	735090905002 681035017340
Upper Temperature Range	104 Degrees Fahrenheit
Voltage	9 Volts

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€ 104.05

Duties & taxes included

In stock

Sold byAmazon BelgiumDelivered 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 Belgium.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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