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 Moisture Tester with 3-Color LCD Display, Audible Alarm & HOLD Function – Ideal for Firewood, Lumber, Home Inspections (Green)

Pinless Moisture Meter for Wood Concrete – Digital Moisture Tester with 3-Color LCD Display, Audible Alarm & HOLD Function – Ideal for Firewood, Lumber, Home Inspections (Green)

Product ID: 351908616

📊3-Color LCD Display for instant moisture level clarity

🔔Audible Alarm alerts you to critical moisture levels

🔦Built-in LED Flashlight for dark, hard-to-reach inspection spots

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$52.59

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Description

🔍 Stay dry, stay ahead: The moisture meter every pro and DIYer needs!

COMPACT READY - Lightweight, battery-powered design with included 9V battery and storage bag—always ready for on-the-go inspections.
PINLESS PRECISION - Non-destructive sensor reads moisture without damaging surfaces—perfect for finished wood, concrete, and drywall.
INSTANT VISUAL ALERTS - 3-color LCD plus audible alarm ensures you never miss a moisture spike during inspections or DIY projects.
EARLY DAMAGE DETECTION - Catch leaks, flooding, and humidity issues before costly repairs become inevitable—protect your investment and peace of mind.
ILLUMINATE HIDDEN RISKS - Integrated LED flashlight lets you confidently inspect crawl spaces, attics, and behind cabinets—no more guesswork in the dark.

The Pinless Moisture Meter MT28 offers accurate, non-invasive moisture detection for wood, concrete, and drywall. Featuring a 3-color LCD display, audible alarm, and built-in LED flashlight, it empowers home inspectors, renovators, and DIY enthusiasts to identify moisture issues early and avoid costly damage. Compact and battery-powered with included accessories, it’s a reliable tool for precise, hassle-free moisture measurement.

Specifications

ASIN	B09BJJX1B8
Batteries	1 Lithium Polymer batteries required. (included)
Batteries Included?	Yes
Batteries Required?	Yes
Battery Cell Type	Zinc Carbon
Best Sellers Rank	#6,557 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 (3,702)
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

Reviews

S**7

18.08.2025

A**É

25.02.2026

N**9

7.08.2025

S**.

26.02.2026

K**N

23.03.2026

D**M

25.11.2025

T**Y

21.03.2026

A**Y

22.04.2026

A**I

23.03.2026

F**2

30.03.2026

C**O

17.05.2025

S**R

13.04.2025

L**E

18.08.2025

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