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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MM8

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 alerts for instant status

📏Measures moisture up to 3/4" deep

🔋Low battery & out-of-range alarms

468973Fr

Duties & taxes included

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Sold byAmazon CongoDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Congo.

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Description

💧 Detect moisture like a pro—stay ahead, stay dry!

SMART ALERTS - 3-color LED bar graph and audible alarms keep you instantly informed of moisture levels and battery status.
ERGONOMIC DESIGN - Comfort-fit handle and large backlit LCD ensure effortless use and clear visibility in any lighting.
PINLESS PRECISION - Non-invasive sensing protects surfaces while delivering accurate moisture readings up to 19mm deep.
MOLD PREVENTION POWER - Early detection with out-of-range alarms helps you stop water damage and mold before it spreads.
MULTI MATERIAL MASTERY - Calibrated settings for drywall, masonry, softwood, and hardwood for versatile, professional-grade detection.

The General Tools MM8 Pinless Moisture Meter offers precise, non-invasive moisture detection up to 3/4" deep in wood, drywall, and masonry. Featuring a bright backlit LCD, 3-color LED alerts, and ergonomic design, it empowers professionals and DIYers to prevent mold and water damage with early, reliable readings. Trusted by experts, this tool combines innovation and ease-of-use for smarter moisture management.

Specifications

ASIN	B01BLXVDFA
Battery Description	Alkaline
Best Sellers Rank	#543 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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468973Fr

Duties & taxes included

In stock

Sold byAmazon CongoDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Congo.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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