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

Product ID: 351908616

📏±5% accuracy

🔔Audible alarm & HOLD function

🔦Built-in LED flashlight

€ 61.79

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Description

💧 Detect moisture before it detects you—stay one step ahead!

INSTANT ALERTS - Audible alarm signals moisture spikes early, helping you prevent costly water damage before it starts.
COMPACT READY - Lightweight, battery-powered design with included 9V battery ensures you’re inspection-ready anytime.
PINLESS PRECISION - Non-destructive moisture detection keeps your surfaces flawless—no pins, no damage.
ILLUMINATE HIDDEN RISKS - Integrated LED flashlight reveals moisture in dark, hard-to-reach spaces like crawl spaces and attics.
VERSATILE SURFACE COMPATIBILITY - Works seamlessly on wood, masonry, concrete—perfect for home inspections and DIY projects.

The Pinless Moisture Meter MT28 offers accurate, non-destructive moisture detection with ±5% precision, an integrated LED flashlight for dark areas, and an audible alarm with HOLD function. Ideal for professionals and DIYers, it works on multiple surfaces including wood, masonry, and concrete, helping prevent costly water damage and structural issues. Compact and battery-powered, it’s a must-have tool for thorough home inspections and maintenance.

Specifications

ASIN	B09BJJX1B8
Batteries	1 9V batteries required. (included)
Battery Cell Type	Zinc Carbon
Best Sellers Rank	#4,682 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #4 in Moisture Meters
Color	Green
Customer Reviews	4.5 4.5 out of 5 stars (3,927)
Date First Available	August 17, 2021
Included Components	1Moisture meter,1User manual,1*9V 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	MT28
Power Source	Battery Powered
Product Dimensions	6.69 x 3.54 x 1.57 inches
Style	MT28
Voltage	9 volts

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€ 61.79

Duties & taxes included

In stock

Sold byAmazon CyprusDelivered 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 Cyprus.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

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