will it detect studs through ridgid foil covered insulation?

The Finder will find a screw 3/8" under sheetrock mud.

Can you use this for finding the rafters in the ceiling of drywall etc. what I'm hoping for is there an sticks with the magnet to a screw and you can

Yes, the magnet is strong enough to hold on most ceilings. If you have popcorn ceilings it may not work as well.

Will this work on lath and plaster walls?

The Kreg Magnetic Stud Finder works best with sheetrock walls as the magnet finds screws roughly 3/8" under the mud. Nails are usually further under lath and plaster walls, so it may not be effective.

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Kreg KMM1000LZ - Kreg Magnetic Stud Finder with Laser-Mark - Stud Finder & Wall Scanner - Magnetic Stud Finder Tool - with Precise Stud Magnet

Kreg KMM1000LZ - Kreg Magnetic Stud Finder with Laser-Mark - Stud Finder & Wall Scanner - Magnetic Stud Finder Tool - with Precise Stud Magnet

Product ID: 531209445

Details

Brand
Kreg
Color
Blue
Material
Durable
Number of Items
1
Number of Pieces
6

🎯Laser-Mark precision

📏Built-in bubble level

🧲Powerful rare-earth magnets

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$U2939

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Description

🛠️ Nail your next project with laser-guided precision and magnetic ease!

TRUSTED KREG QUALITY - Engineered for pros and DIYers alike, bridging the gap between concept and craftsmanship.
POCKET SIZED POWERHOUSE - Compact, lightweight design fits in your pocket—ready to go wherever your projects take you.
HANDS FREE MAGNETIC DETECTION - Dual rare-earth magnets cling to walls, effortlessly locating screws and nails in wood or metal studs.
PINPOINT ACCURACY WITH LASER MARK - Class 2 laser projects exact stud location for flawless placement every time.
PRECISION CENTERED MARKING NOTCHES - Mark with confidence using centered notches that guide your screws and nails perfectly.

The KMM1000LZ Kreg Magnetic Stud Finder combines advanced Laser-Mark technology with powerful rare-earth magnets to deliver precise stud location and hands-free operation. Its compact design and built-in bubble level make it an essential, pocket-friendly tool for carpenters and DIY professionals seeking reliable, accurate wall scanning and marking.

Specifications

ASIN	B0C31C8WLC
Best Sellers Rank	#6,908 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #16 in Stud Finders & Scanners
Brand Name	Kreg
Color	Blue
Customer Reviews	4.5 4.5 out of 5 stars (1,086)
Global Trade Identification Number	00647096811556
Included Components	KREG FINDER STUD MAGNETIC W/LSR-MRK KMM1000LZ
Item Weight	132 Grams
Manufacturer	KREG
Material Type	Durable plastic polymer
Model Number	KMM1000LZ
Number of Pieces	6
Part Number	KMM1000LZ
UPC	647096811556

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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