General Tools Digital Moisture Meter MMD7NP - Humidity Sensor- Pinless and Non-Invasive

Key Specifications

Product Dimensions
3"W x 1.13"H
Battery Description
Alkaline
Item Weight
4 ounces
Brand
‎General Tools
Manufacturer
General Tools Mfg Co In
Material
other

Reviewed by 3978 people this week!

★★★★☆
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General Tools
4.4
3978 reviews
Buy at Amazon
AmazonPrime Delivery • 30-Day Returns

General Tools Digital Moisture Meter MMD7NP - Humidity Sensor- Pinless and Non-Invasive

The General Tools MMD7NP is a compact pinless (non-invasive) moisture meter intended for quick moisture checks in wood, drywall and masonry without puncturing the surface. It scans up to about 3/4" (≈19 mm) deep and reports moisture using a large backlit LCD plus a 3-color LED bargraph and audible alarm for fast go/no-go decisions. The unit is aimed at home inspectors, DIYers and contractors who want to locate damp areas, check firewood or verify that building materials have dried after a leak.

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2-Year Warranty
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Key Features

WOOD MOISTURE METER: Prevent water and moisture build-up with our humidity reader. It can quickly determine what level of remediation is needed to keep your family safe. High levels of dampness that go untreated can cause hazardous living conditions.
PROTECT YOUR WORK SURFACE: This tool has no pins, so it won't mar, scratch, or damage walls. It features auto-calibrating, a 2" diagonal backlit LCD screen, a 3-color LED bar graph, a hold button, and an audible alert for fast and accurate detection.
DEEP READER: It can read the levels up to 3/4" (19mm) deep into the surface with a broad measurement range of 0 to 53% for softwood, 0 to 35% for hardwood, and relative readings for wallboard, drywall, and masonry.
MOLD DETECTOR: Early prevention is vital when stopping mold formation. Check and test suspicious water stains around the house to determine if the area is wet or has already dried. It includes an out-of-range alarm and a low 9V battery alert.
GENERAL TOOLS: We have been a recognized leader in the innovation, design, and development of specialized precision tools for many years. We encourage craftspeople, artisans, and DIYers to work smarter, measure better, and increase productivity.

The General Tools MMD7NP is a compact pinless (non-invasive) moisture meter intended for quick moisture checks in wood, drywall and masonry without puncturing the surface. It scans up to about 3/4" (≈19 mm) deep and reports moisture using a large backlit LCD plus a 3-color LED bargraph and audible alarm for fast go/no-go decisions. The unit is aimed at home inspectors, DIYers and contractors who want to locate damp areas, check firewood or verify that building materials have dried after a leak.

Key Considerations

1

Measurement method — pinless (surface contact, non-destructive).

2

Depth & ranges — reads to ~3/4" (19 mm); measurement ranges: 0–53% for softwood, 0–35% for hardwood, and relative readings for wallboard/drywall/masonry.

3

Readout & alerts — 2" diagonal backlit LCD, 3-color LED bar (green/orange/red), data-hold and audible alarm; out-of-range and low-battery indicators.

4

Portability & power — lightweight handheld design; uses 9V battery (low-battery alert included).

1

Because the MMD7NP is pinless, it measures moisture by sensing dielectric changes beneath the surface — so you don’t leave small probe holes in finished surfaces. That makes it ideal for finished flooring, painted walls, furniture and visible trim where preserving the surface is important. For quick, non-destructive surveys it’s faster and cleaner than pin-type meters

These factors represent the most critical aspects that will impact your satisfaction with this product.

Customer Reviews

Good moisture meter
2025-12-08T05:08:47.577Z

Seems to work well.

U
Anonymous rw
Needs to recalibrate after awhile
2025-12-08T05:09:16.089Z

Stopped working after a few months but it just needed to recalibrate. The troubleshooting on Amazon is useless. Just hold down “hold” until it says 101, when it changes to 102, let go and that should do it.

U
Amanda

Frequently Asked Questions

Final Verdict

The General Tools MMD7NP is a practical, easy-to-use pinless moisture meter that excels at non-destructive scanning for moisture in wood, drywall and masonry down to ~3/4" deep. Its large backlit display, 3-color LED bar and audible alarm make it fast for on-site triage after leaks or when checking materials before finishing. It’s an attractive choice if you need to preserve finished surfaces and want rapid surveys — just be aware of the depth and material-type limitations and consider a complementary pin meter or thermal imager for precise, localized, or deeper moisture verification.