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

🌟 Don't Let Moisture Ruin Your Day!

🌲 VERSATILE SETTINGS - Separate modes for drywall, masonry, softwood, and hardwood.
🚫 MOLD PREVENTION HERO - Early moisture detection to stop mold before it starts!
🖐️ ERGONOMIC EXCELLENCE - Designed to fit comfortably in your hand for prolonged use.
🖥️ READABILITY REDEFINED - Hi-visibility white on black screen for effortless reading from any angle.
🔍 PRECISION AT YOUR FINGERTIPS - Experience moisture detection with an accuracy of +/-0.01%!

The General Tools Pinless LCD Moisture Meter (MM8) is a cutting-edge moisture detection tool designed for professionals and DIY enthusiasts alike. With its ergonomic design, high-visibility display, and versatile settings for various materials, this device ensures accurate moisture readings to prevent mold and water damage effectively.

Specifications

Manufacturer	General Tools
Part Number	MM8
Product Dimensions	16 x 7.11 x 7.37 cm; 154.22 g
Batteries	1 9V batteries required. (included)
Item model number	MM8
Colour	White
Style	Digital Pinless LCD w TriColor Bar Graph
Material	Plastic
Pattern	Detector
Power Source	Battery Powered
Voltage	9 Volts
Item Package Quantity	1
Measurement System	Metric
Measurement Accuracy	+/-0.01%
Plug profile	Surface Mount
Special Features	Low-battery icon displays status
Included Components	Console^Battery (1)
Batteries included?	Yes
Batteries Required?	Yes
Battery Cell Type	Alkaline
Battery description	Alkaline
Item Weight	154 g

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