Swan Tool Group MERLIN Flat Double Square

The MERLIN is the only square on the market that lays completely flat in any position! It combines the functions of a double square, framing square, and ruler into one lightweight tool. Whether you're building face frames, cabinet boxes, or laying out joinery, the MERLIN Square stays flat and accurate for precise results.

Thanks to its ability to lay completely flat, the MERLIN is ideal for inside and outside layouts, edge referencing, and ruler-style measurement. The built-in shelf tab feature adds stability and control during layout, making it easier to maintain consistent reference points across materials.

Exclusive "Tru-Mark" technology eliminates one of the most common sources of layout error: compensating for pencil thickness. Integrated pencil saddles and precision side notches allow you to place your pencil exactly where the measurement is needed, creating accurate, repeatable marks without offset calculations or guesswork. This means faster layout work, fewer mistakes, and improved accuracy.

The ruler on the MERLIN is interchangeable with the RED TAIL Ruler Set so you can customize your length based on the project at hand.