How can a compass with 12" legs measure 30" between the points like in the picture?

It only needs to have 15" between points to make a 30" circle. 12" legs achieve that less than 90° open.

Will this accommodate a paint marker, larger than a pencil?

The holder for the pencil is about the size of a standard pencil, so I would say no. I suppose you could tape the marker to it, but it won't fit in the holder.

How do you get it to open. I received mine in the mail today and I can’t get it to spread apart

All you have to do is to simply spread it apart as needed. You may have to use a little pressure. One thing that could cause trouble is the little black locking nut on the top. Make sure it is loose first Just turn it counter-clockwise to loosen it. To fit a regular number 2 pencil in the holder, you may have to sand it down a little.

Great Compass , but we’re missing the two set screws 😥

The carpenter's 12" compass I received lacked the locking and pencil retention screws necessary for its use. I e-mailed the Mr. Pen folks to request the screws early that evening. They responded via e-mail around three the next morning apologizing for the problem and stating that if I'd send them my Amazon order number they would be happy to send me a new compass. I did so and received notification that my order had shipped that same day. Two days later I received my new compass. No hassle and prompt, cheerful customer service make this a great outfit to do business with. And yes, the product was of great quality.

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Mr. Pen- Professional Compass for Woodworking, Compass with Wing

Product ID: 214776036

Details

Brand
Mr. Pen
Color
Silver
Material
Metal
Product Dimensions
12"L x 12"W
Style
Classic

📏12-inch leg for large layouts

🔒Lockable sliding nut for precision

🛠️All-metal durable construction

152 K

Duties & taxes included

In stock

Sold byAmazon Papua New GuineaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🛠️ Master your craft with precision and style — don’t settle for less!

BUILT TO ENDURE - All-metal construction delivers professional-grade durability that stands the test of time.
DRAW BIG DRAW BOLD - 12-inch legs enable circles up to 30 inches (76 cm) in diameter for expansive designs.
PRECISION THAT LASTS - Lockable sliding nut ensures repeatable, slip-free measurements every time.
EFFORTLESS PENCIL SWAP - Innovative pencil holder lets you quickly change and sharpen pencils without hassle.
VERSATILE CRAFTING POWER - Perfect for woodworking, metalwork, leather, and geometry—one tool, endless projects.

The Mr. Pen Professional Compass is a robust all-metal tool designed for precision in woodworking, metalwork, leather crafting, and geometry. Featuring 12-inch legs capable of drawing circles up to 30 inches in diameter, a lockable sliding nut for consistent measurements, and a convenient pencil holder for easy pencil changes, it combines durability with versatility to elevate your layout and drawing tasks.

Specifications

ASIN	B086RV9W72
Best Sellers Rank	#5,883 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #1 in Joint Calipers & Dividers #1,120 in Hand Tools (Tools & Home Improvement)
Brand Name	Mr. Pen
Color	Silver
Customer Reviews	4.4 4.4 out of 5 stars (3,433)
Item Dimensions L x W	12"L x 12"W
Item Highlight	Professional Carpenter Pencil Compass for Geometry, Drawing
Manufacturer	Mr. Pen
Material Type	Metal
Model	GW01
Number of Items	1
Part Number	GW01
Style Name	Classic
UPC	850016784230
Unit Count	1 Count

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