wll this work on finding a leak on a fiberglass boat?

It can find 'trapped moisture' as would be expected if WITHIN the fiberglass there is a wetted plywood laminate. Certainly the moisture in that '(mapped) area' would have a source, usually a deck fitting for instance. Be careful on the 'analysis,' as it may read non-structural (decorative) wall covering on the other side. Also, try to perform studies on a 'very dry' day.

What is the accuracy of this meter, and what was it compared to or tested against?

The accuracy is ± 4%,. the reference relative drying value is the measured value of conventional air humidity (relative humidity 50%~70%, temperature 25 ℃)+compensation value of human body.

Where is this manufactured?

Looks like China in the description.

What is the difference between pinless sand pinless color?

As to what I understood, Pinless is a bit less accurate gives you moisture readings percentage based on humidity so if there is something as a metal behind it senses the coldness of metal and adds it as moisture vs pin one is dead spot on which senses the humidity as the pins go into drywall, wood etc Hope this helps

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Pinless Moisture Meter for Wood Digital Wall Moisture Detector | Non Destructive,Moisture Tester, Audible Alarm & HOLD Function, Ideal for Firewood, Lumber, Home Inspections

Pinless Moisture Meter for Wood Digital Wall Moisture Detector | Non Destructive,Moisture Tester, Audible Alarm & HOLD Function, Ideal for Firewood, Lumber, Home Inspections

Product ID: 351908616

📏±5% accuracy

🔋Includes 9V battery

🔦Built-in LED flashlight

SAR 130

Duties & taxes included

In stock

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Description

🔍 Detect moisture before it becomes a disaster—stay ahead, stay dry!

PORTABLE READY - Compact, lightweight, and battery-powered with included 9V battery and storage bag—inspection on the go.
PINLESS PRECISION - Non-destructive sensor reads moisture without damaging surfaces—perfect for finished wood, masonry, and concrete.
EARLY LEAK DETECTION - Quickly identify moisture from leaks or humidity to prevent costly structural damage.
USER FRIENDLY DESIGN - Easy-to-read digital display with audible alarm and HOLD function for confident readings every time.
ILLUMINATE HIDDEN TROUBLE - Integrated LED flashlight lets you inspect dark crawl spaces and attics effortlessly.

The Pinless Moisture Meter MT28 offers accurate, non-invasive moisture detection with ±5% precision, ideal for wood, concrete, and masonry. Featuring a built-in LED flashlight and audible alerts, it empowers home inspectors and DIY pros to identify hidden moisture issues early, preventing expensive repairs. Compact and battery-powered with included accessories, it’s the essential tool for proactive home maintenance.

Specifications

ASIN	B09BJJX1B8
Batteries	1 9V batteries required. (included)
Battery Cell Type	Zinc Carbon
Best Sellers Rank	#3,864 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #3 in Moisture Meters
Color	Green
Customer Reviews	4.5 4.5 out of 5 stars (3,914)
Date First Available	August 17, 2021
Included Components	1Moisture meter,1User manual,1Storage bag,19V Battery
Item Package Quantity	1
Item Weight	5.2 ounces
Item model number	MT28
Manufacturer	SHENZHEN REDDRAGON INSTRUMENTS CO.,LTD
Material	PCB+Plastic
Measurement Accuracy	+/-5%
Mounting Type	Wall Mount
Part Number	MT19B
Power Source	Battery Powered
Product Dimensions	6.69 x 3.54 x 1.57 inches
Style	MT28
Voltage	9 volts

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