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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Description

💧 Detect moisture before it’s a problem — stay dry, stay ahead!

ERGONOMIC READABLE - 2" backlit LCD digits with ergonomic handle for all-day comfort
MULTI MATERIAL MASTERY - Calibrated settings for drywall, masonry, softwood, and hardwood
INTUITIVE VISUAL ALERTS - 3-color LED bar graph plus audible alarms keep you instantly informed
PROACTIVE MOLD PREVENTION - Early leak detection with out-of-range and low battery alerts
PRECISION MOISTURE DETECTION - Pinless tech reads up to 19mm deep without surface damage

The General Tools MM8 is a professional-grade, pinless moisture meter designed for accurate, non-invasive moisture detection up to 3/4" deep in wood and building materials. Featuring a high-visibility backlit LCD, 3-color LED alerts, and ergonomic design, it empowers managers and DIY pros to prevent costly water damage and mold with precision and ease.

Specifications

Manufacturer	General Tools
Part number	MM8
Item Weight	154 g
Product Dimensions	16 x 7.11 x 7.37 cm; 154.22 g
Batteries	1 9V batteries required. (included)
Item model number	MM8
Color	Black/White
Style	Pinless/White on Black Screen
Material	Plastic
Pattern	Detector
Power source type	Battery Powered
Voltage	9 Volts
Item Package Quantity	1
Measurement System	Metric
Measurement Accuracy	+/-0.01%
Plug Profile	Freestanding
Special Features	Low-battery icon displays status
Included components	Console^Battery (1)
Batteries Included?	Yes
Batteries Required?	Yes
Battery Cell Type	Alkaline
tech_spec_battery_description_toys	Alkaline

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