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

⭕Draws circles up to 30 inches

📏12-inch leg for precision

🔒Lockable sliding nut for repeatable accuracy

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115.31 DT

Duties & taxes included

In stock

Sold byAmazon TunisiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Details

Brand
Mr. Pen
Color
Silver
Material
Metal

Description

🛠️ Unlock precision, craft with confidence!

CIRCLE MASTERY - Effortlessly draw perfect circles up to 30 inches in diameter—ideal for large-scale projects and detailed designs.
SECURE REPEATABLE - Lockable sliding nut design guarantees fast leg adjustments and consistent, repeatable measurements every time.
PRECISION MEETS POWER - All-metal construction ensures durability and professional-grade performance for woodworking, metalwork, and more.
VERSATILE MEASURING TOOL - Functions as a scribe and divider to copy measurements quickly and accurately across various materials.
QUICK CHANGE PENCIL HOLDER - Easily swap and sharpen pencils without interrupting your workflow (pencil not included).

The Mr. Pen Professional Compass is a robust all-metal drafting tool designed for woodworking, carpentry, metalwork, and more. Featuring a 12-inch leg and the ability to draw circles up to 30 inches in diameter, it includes a lockable sliding nut for precise, repeatable measurements and a pencil holder for quick pencil changes. Trusted by thousands with a 4.4-star rating, this compass blends durability with versatility for professionals and hobbyists alike.

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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115.31 DT

Duties & taxes included

In stock

Sold byAmazon TunisiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Tunisia.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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2 days ago

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