How accurate are the readings for walls under windows?

I have no idea regarding the accuracy of this meter, I have an MT-19, which seems accurate enough for my needs. Suggestion: test on dry cardboard, progressively increase the moisture content, take several readings. This should give you an idea how damp your wall is.

Any good for caravans ?

actually, this is moisture meter for wood and paper or even the building.

Do you have to stick the pins into the material?

Yes, the pin should be into the material. But you could try the MT28 pinless wood moisture meter

Can it measure moisture, from a painted brick wall? It gives me 0% reading, once I move it around it will possibly change to 2.2%~3%

You can remove the painted cover. but painted brick wall is good for water blocking effect.

Rdinscos Pin Type Damp Moisture Meter With Large Backlit Lcd

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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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₱3929

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Sold byAmazon PhilippinesDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔍 Pinpoint moisture issues before they escalate—because your projects deserve precision.

ENERGY SMART PORTABLE - 5-minute auto shutoff and low battery indicator ensure uninterrupted operation on the go.
PRECISION YOU CAN TRUST - Get rapid, reliable moisture readings with ±5% accuracy and 0.1% resolution—never miss a hidden leak or mold risk.
VERSATILE 4 MODE DETECTION - Seamlessly switch between hardwood, softwood, packing, and building modes for all your inspection needs.
DURABLE USER FRIENDLY DESIGN - Compact, lightweight, and equipped with replaceable probes plus a wrench for long-term, hassle-free use.
INSTANT ALERTS CLEAR DISPLAY - Tri-color LED and audible alerts combined with a large backlit screen keep you informed in any lighting condition.

The RDINSCOS MT19 Pin-Type Damp Moisture Meter offers fast, accurate moisture detection across a wide 5%-75% range with ±5% accuracy. Featuring a large backlit LCD, tri-color LED alerts, and a built-in flashlight, it’s designed for professionals tackling wood, walls, plaster, and more. Its 4-mode versatility, replaceable probes, and energy-saving auto-off make it an essential, portable tool for home inspectors, renovators, and woodworking pros.

Specifications

ASIN	B0965G6DK7
Batteries	3 AAA batteries required. (included)
Batteries Required?	Yes
Batteries included?	Yes
Battery Cell Type	Other Than Listed
Best Sellers Rank	2,667 in Garden ( See Top 100 in Garden ) 47 in Scanners & Testers 187 in Lawn & Garden Watering Equipment
Colour	Black - Backlit Display
Customer Reviews	4.6 4.6 out of 5 stars (6,241)
Date First Available	13 Dec. 2023
Delivery information	We cannot deliver certain products outside mainland UK ( Details ). We will only be able to confirm if this product can be delivered to your chosen address when you enter your delivery address at checkout.
Guaranteed software updates until	unknown
Included Components	1 × caravan damp meter, 3 × AAA batteries, 4 × probe pins, 1 × wrench, 1 × storage bag, 1 × user manual
Item Weight	210 g
Item model number	RDINSCOS_MT19A
Manufacturer	SHENZHEN REDDRAGON INSTRUMENTS CO.,LTD
Part Number	MT19
Pattern	Pin-type
Power Source	Battery Powered
Product Dimensions	10 x 4 x 3 cm; 210 g
Shape	Large Backlit Color Display
Size	Small

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