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 MM8 Pinless Moisture Meter for Wood, Walls & Mold Detection | Non-invasive wood moisture meter for walls, drywall & lumber. Mold detector for home moisture & humidity moisture testing.

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

📊3-color LED bar graph + audible alerts

📏Measures moisture up to 3/4" deep

🔋Low battery alert for uninterrupted use

KSh15409

Duties & taxes included

In stock

Sold byAmazon KenyaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

💧 Stay ahead of leaks and mold with precision you can trust!

MULTI MATERIAL MASTERY - Tailored settings for drywall, masonry, softwood, and hardwood—perfect for diverse professional inspections.
ERGONOMIC USER FRIENDLY - Comfort grip handle with a high-contrast backlit LCD ensures effortless readings anytime, anywhere.
PINLESS PRECISION DETECTION - Non-invasive sensing protects surfaces while delivering accurate moisture readings up to 19mm deep.
EARLY MOLD LEAK PREVENTION - Detect hidden moisture early to stop mold growth and costly water damage before it starts.
INTUITIVE VISUAL AUDIO ALERTS - 3-color LED bar graph and audible alarms eliminate guesswork—know instantly when moisture levels spike.

The General Tools MM8 Pinless Moisture Meter offers professional-grade, non-invasive moisture detection for wood, drywall, masonry, and more. Featuring deep sensing up to 3/4" (19mm), a bright backlit LCD, 3-color LED alerts, and audible alarms, it empowers managers and pros to identify water damage and mold risks early. Ergonomically designed with auto-calibration and low battery alerts, this compact tool is essential for smart, proactive building maintenance and inspection.

Specifications

ASIN	B01BLXVDFA
Battery Description	Alkaline
Best Sellers Rank	#528 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 (898)
Global Trade Identification Number	00681035017340
Included Components	Console^Battery (1)
Item Dimensions W x H	2.8"W x 6.3"H
Item Highlight	Non-invasive wood moisture meter for walls, drywall & lumber. Mold detector for home moisture & humidity moisture testing.
Item Type Name	---
Item Weight	5.44 ounces
LowerTemperature Range	32 °F
Manufacturer	General Tools
Model	MM8
Mounting Type	Surface Mount
Number of Items	1
Operating Humidity	5% to 95%
Part Number	MM8
UPC	735090905002 681035017340
Unit Count	1 Count
Upper Temperature Range	104 °F
Voltage	9 volts

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