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 bar graph & audible alerts

📏3/4" deep non-invasive sensing

🔋Low battery & out-of-range alarms

WS$574

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Description

💧 Detect moisture like a pro—before it’s too late!

INSTANT CLARITY - 2" backlit LCD with color-coded LED alerts for quick, confident readings
PINLESS PRECISION - Non-marring tech reads moisture up to 3/4" deep without damaging surfaces
ERGONOMIC EFFICIENCY - Comfort grip design for prolonged use without fatigue
MOLD PREVENTION POWER - Early leak detection with audible alarms to stop mold before it starts
MULTI MATERIAL MASTERY - Calibrated settings for drywall, masonry, softwood, and hardwood

The General Tools MM8 Pinless Moisture Meter offers precise, non-invasive moisture detection up to 3/4" deep across multiple materials including wood, drywall, and masonry. Featuring a bright backlit LCD, 3-color LED alerts, and audible alarms, it empowers professionals and DIYers to prevent water damage and mold with ergonomic ease and reliable accuracy.

Specifications

ASIN	B01BLXVDFA
Battery Description	Alkaline
Best Sellers Rank	#461 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 (902)
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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WS$574

Duties & taxes included

In stock

Sold byAmazon SamoaDelivered 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 Samoa.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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