This could easily become the most-used measuring tool in your shop. An ideal size for cabinet-making, it has the accuracy of an engineer's square (0.001" per inch of length). All four edges are ground, and both faces are graduated on the inside and outside edges. The Imperial square is graduated in 32nds on the 3" leg and in 16ths on the 6" leg, while the metric version is graduated in half millimetres on the 8cm leg and in millimetres on the 15cm leg.

Each is useful not only for general layout and checking whether surfaces are flat or straight, but also for machine set-up, since it lets you measure and check for square on the same plane. Since the legs are made from chrome-plated high-carbon steel, they can be marked upon with pencil for direct-reference use. Legs are 3/4" wide on the Imperial, and 20mm wide on the metric.

The relieved interior corner ensures that the square seats well, even over saw whiskers. The markings are etched and black-filled for ease of reading. This thin, compact square fits easily into an apron slot or pocket so it’s there when you need it. Made in USA.