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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
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It took a bit to break in, but now it adjusts smoothly. It is dead on accurate and very well constructed. I love the two different edges on the ruler. The true mark side is great for pencil lines, and the other side is perfect for knife lines. I will be picking up more Swan Tools in the future.
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Stephen · Today
absolutely stellar job from it being everything I expected...except it said expected delivery weds but it showed up tues. thanks I see more swan tools in my future
Anthony · October 6, 2026
Works as advertised. Good measurement is the key to a good project and I'm trying to improve my measuring tools.