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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📐 Measure smarter, not harder — never miss a drop!

PINLESS PRECISION - Non-invasive moisture detection under finished surfaces protects your work.
READY WHEN YOU ARE - Includes 9V battery and 1-year warranty—start measuring with confidence right out of the box.
EFFORTLESS OPERATION - Auto-calibrating with HOLD button and out-of-range alerts keeps you in control without guesswork.
CLEAR VISUAL FEEDBACK - Backlit 2-inch LCD plus tricolor bar graph delivers instant, easy-to-read moisture levels.
SMART MATERIAL SETTINGS - Tailored detection modes for drywall, masonry, softwoods, and hardwoods ensure pinpoint accuracy.

The General Tools MMD7NP Moisture Meter offers non-invasive, pinless moisture detection with ±4% accuracy up to 20mm deep. Featuring a backlit LCD and tricolor LED bar graph, it provides clear, real-time readings tailored for drywall, masonry, and various woods. Powered by a 9V battery with auto power-off and out-of-range alerts, this tool is designed for professionals and DIYers who demand precision and ease in moisture measurement.

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€ 132.70

Duties & taxes incl.

Finlandstore

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Manufacturer	General Tools Mfg Co In
Part Number	MMD7NP
Product Dimensions	2.87 x 7.62 x 16.51 cm; 113.4 g
Batteries	1 9V batteries required. (included)
Item model number	MMD7NP
Size	Pinless
Colour	multi
Style	Digital LCD with Tricolor Bar Graph
Material	other
Pattern	Detector
Power Source	Battery Powered
Voltage	9 Volts
Item Package Quantity	1
Number of handles	1
Plug profile	Freestanding
Included Components	.....
Batteries included?	Yes
Batteries Required?	Yes
Battery Cell Type	Alkaline
Battery description	9V
Item Weight	113 g

General Tools Moisture Meter, Pinless, Digital LCD with Tricolor Bar Graph (MMD7NP)

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