Lay flat design: Stays flat in any orientation for accurate inside and outside layouts
Built-in shelf tab: Adds stability and control during layout for consistent reference points
Tru Mark Edge: Ensures precise line placement without guesswork or offset errors
Expandable platform: Interchangeable with Red Tail ruler set for customizable measurements
Dedicated pencil saddle: Allows precise, repeatable marking for clean, accurate lines
Summarized by Shop
The MERLIN is a layout square that combines the functions of a double square, framing square, and ruler into one lightweight, flat-profile tool. Whether you're building face frames or laying out joinery, the Merlin Square stays flat, accurate, and right where you need it.
Lay Flat Design - The only square on the market that lays complet
Material
Anodized aluminum, plastic
Color
Red, black, white
Pattern
Solid
Expandable ruler
Interchangeable with Red Tail ruler set (102 mm, 152 mm, 305 mm)
Dimensions
Height: 125 mm, Length: 203 mm, Width: 125 mm
Warranty
1 year
Summarized by Shop
4.8
58 ratings
5
4
3
2
1
No longer need to take ruler out of a square. Genius.
The texture is different from what is expected. But easier to grip.
A
Anonymous · 18 days ago
This is awesome. Far more superior than any cheap Chinese junk metal out there. Finally American tool worth the price. Keep it up swan tool. Can’t wait till the next new product comes.
M
Mike · June 25, 2026
This is an extremely well made and accurate tool. It’s so nice I almost hate to use it but I don’t buy tools to let them look good in my tool box. A bit on the pricey side however it’s worth every penny. I was so impressed that I went back and purchased the combo square and protractor. I honestly like these tools better than woodpeckers tools.