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, 8 Inch Compass with Wing, Large Compass for Geometry, Compass Drawing Tool, Woodworking Compass, Pencil Compass for Carpenter, Drafting, Drawing Compass

Mr. Pen- Professional Compass for Woodworking, 8 Inch Compass with Wing, Large Compass for Geometry, Compass Drawing Tool, Woodworking Compass, Pencil Compass for Carpenter, Drafting, Drawing Compass

Product ID: 500580908

Details

Brand
Mr. Pen
Colour
Silver
Material
Carbon Steel
Product dimensions
20.3L x 20.3W
Style
Modern

📏8-inch precision reach

🔒Lockable wing for repeat accuracy

🛠️Durable rust-resistant carbon steel

¥3198

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Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🛠️ Master every curve with precision and style!

BUILT TO LAST - Crafted from high-quality carbon steel that resists rust and corrosion for long-term use.
LOCK REPEAT - Lockable wing design ensures consistent, repeatable measurements every time.
SMOOTH OPERATOR - Glossy, ground-finish surface glides effortlessly for flawless scribing and drawing.
VERSATILE PRO TOOL - Ideal for woodworking, carpentry, leatherwork, drafting, and DIY crafts—your all-in-one measuring companion.
PRECISION MEETS POWER - Draw perfect circles up to 18 inches with unmatched accuracy.

The Mr. Pen 8-inch Professional Compass is a premium all-metal drafting tool designed for precision in woodworking, carpentry, leatherwork, and more. Featuring a lockable wing for repeatable accuracy and a pencil holder for circles up to 18 inches, it’s crafted from durable carbon steel with a smooth, rust-resistant finish—perfect for professionals and creatives demanding reliability and finesse.

Specifications

ASIN	B086R744JY
Best Sellers Rank	8,631 in Stationery & Office Supplies ( See Top 100 in Stationery & Office Supplies ) 6 in Drafting Compasses
Brand	Mr. Pen
Colour	Silver
Country Of Origin	China
Customer Reviews	4.4 4.4 out of 5 stars (3,256)
Item Dimensions L x W	20.3L x 20.3W centimetres
Manufacturer	Mr. Pen
Manufacturer Part Number	GA01
Material	Carbon Steel
Model Number	GA01
Number of Items	1
Style Name	Modern
UPC	850016784223
Unit Count	1.0 count

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¥3198

Duties & taxes included

In stock

Sold byAmazon JapanDelivered 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 Japan.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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Excellent communication throughout the order process. Product is perfect.

2 weeks ago

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