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 Digital Moisture Meter MMD7NP - Humidity Sensor- Pinless and Non-Invasive

Product ID: 253739927

Details

Battery description
9 volt battery
Brand
General Tools
Colour
multi
Item weight
0.25 Pounds
Product dimensions
7.6W x 2.9H

📊3-color LED bar graph for instant status

📏Reads moisture up to 3/4" deep

🔋Includes long-lasting 9V battery

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¥17142

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In stock

Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

💧 Stay dry, stay safe — measure moisture like a pro!

INSTANT VISUAL ALERTS - 3-color LED bar graph plus audible alerts keep you ahead of mold risks.
USER FRIENDLY DISPLAY - Backlit 2" LCD screen with hold button for easy reading in any light.
PINLESS NON INVASIVE - Protect your surfaces—no scratches, no damage, just precision.
DEEP MOISTURE DETECTION - Measures moisture up to 19mm deep for accurate remediation decisions.
TRUSTED INDUSTRY LEADER - General Tools innovation ensures reliability for pros and DIYers alike.

The General Tools Digital Moisture Meter MMD7NP offers pinless, non-invasive moisture detection up to 3/4" deep with a broad measurement range. Featuring a backlit LCD, 3-color LED bar graph, audible alerts, and an included 9V battery, it’s designed to protect surfaces while providing fast, accurate readings to prevent mold and water damage. Trusted by professionals and DIY enthusiasts, this compact, easy-to-use tool is essential for maintaining healthy, safe environments.

Specifications

ASIN	B00HARYVUQ
ASIN	B00HARYVUQ
Batteries	1 9V batteries required. (included)
Battery Description	9 volt battery
Best Sellers Rank	#979 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #1 in Moisture Meters
Brand Name	General Tools
Color	multi
Country Of Origin	China
Country of origin	China
Customer Reviews	4.4 4.4 out of 5 stars (3,972)
Customer reviews	4.4 4.4 out of 5 stars (3,972)
Date First Available	3 April 2014
Department	Unisex Adult
Global Trade Identification Number	00681035015834
Included Components	.....
Is Discontinued By Manufacturer	No
Item Dimensions W x H	7.6W x 2.9H centimeters
Item Type Name	....
Item Weight	0.25 Pounds
Item model number	MMD7NP
LowerTemperature Range	32 Degrees Fahrenheit
Manufacturer	General Tools Mfg Co In
Manufacturer	General Tools Mfg Co In
Model	MMD7NP
Mounting Type	Freestanding
Operating Humidity	Wide
Part Number	MMD7NP
Product Dimensions	2.87 x 7.62 x 16.51 cm; 113.4 g
Smart Home Compatibility	Not Smart Home Compatible
Temperature Accuracy	±1°C
Temperature Reading Accuracy	plus_minus_3_degrees_fahrenheit
UPC	021113026145 681035015834 753248093142 031113198551 080000324931 044905098113 069060295955 971485411967 079531646414
Unit Count	1 Count
Upper Temperature Range	122 Degrees Fahrenheit
Voltage	9 Volts

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