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

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 precision leg

🔒Lockable sliding nut for repeatable accuracy

🛠️All-metal durable construction

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₩40152

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Sold byAmazon South KoreaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Details

Brand
Mr. Pen
Color
Silver
Material
Metal

Description

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

BUILT TO LAST - All-metal design crafted for professional-grade durability
VERSATILE MASTERY - Perfect for woodworking, carpentry, metalwork, leatherwork, and geometry
SMART PENCIL HOLDER - Easily swap and sharpen pencils without interrupting your workflow
PRECISION MEETS POWER - Draw circles up to 30 inches with unmatched accuracy
EFFORTLESS ADJUSTMENTS - Lockable sliding nut ensures quick, repeatable measurements every time

The Mr. Pen Professional Compass is a robust all-metal drafting tool designed for professionals and enthusiasts alike. Featuring a 12-inch leg capable of drawing circles up to 30 inches in diameter, it offers precise, repeatable measurements thanks to its lockable sliding nut. Ideal for woodworking, carpentry, metalwork, and more, it includes a smart pencil holder for quick pencil changes, making it a versatile and durable companion for any detailed project.

Specifications

ASIN	B086RV9W72
Best Sellers Rank	#5,427 in Office Products ( See Top 100 in Office Products ) #3 in Drafting Compasses
Brand	Mr. Pen
Brand Name	Mr. Pen
Color	Silver
Customer Reviews	4.4 out of 5 stars 3,315 Reviews
Item Dimensions L x W	12"L x 12"W
Manufacturer	Mr. Pen
Material	Metal
Material Type	Metal
Model	GW01
Part Number	GW01
Product Dimensions	12"L x 12"W
Style	Classic
Style Name	Classic
UPC	850016784230
Unit Count	1.0 Count

Reviews

H**Ć

3.04.2026

M**T

22.04.2026

S**.

13.04.2026

L**R

8.04.2026

W**I

25.04.2026

L**.

29.08.2025

C**F

28.03.2023

D**E

4.03.2026

E**S

16.01.2026

D**Z

17.10.2022

C**N

10.06.2025

江**也

30.05.2021

S**T

20.12.2025

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