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

Pinless Moisture Meter for Wood Concrete 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

6797 kr

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Sold byAmazon IcelandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

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

INSTANT ALERTS - Audible alarm signals moisture presence early—stop costly water damage before it starts.
VERSATILE SAFE - Works flawlessly on multiple surfaces without drilling or pins—perfect for finished walls and sensitive materials.
PINLESS PRECISION - Non-destructive moisture detection for wood, concrete & drywall—no damage, no guesswork.
READY OUT OF THE BOX - Includes 9V battery, storage bag, and user manual—professional-grade inspection anytime, anywhere.
ILLUMINATE HIDDEN RISKS - Integrated LED flashlight reveals moisture in dark, hard-to-reach spaces like crawl spaces and attics.

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 home inspectors, DIYers, and professionals, it works on wood, concrete, drywall, and more without damaging surfaces. Battery-powered and ready to use, it helps prevent costly water damage by identifying moisture early.

Specifications

ASIN	B09BJJX1B8
Batteries	1 9V batteries required. (included)
Batteries Included?	Yes
Batteries Required?	Yes
Battery Cell Type	Zinc Carbon
Best Sellers Rank	#7,161 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 (3,887)
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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