T3 is designed in a way that a symmetrical triangle can be formed through using 3 of its individual triangular ruler, such design allows each T-ruler to carry 4 scales/graduations.

The Titanium Triangular Ruler Pen is a standout in the realm of multi-tools. Its robust construction, combined with a range of versatile features, makes it an indispensable accessory for anyone ...

It may sound like a crazy device, but this ruler that doubles as a fountain pen is one clever piece of industrial design. Its name is Escala, and it may be architects’ newest best friend. Escala ...

The triangular form fits comfortably in your grip, although it feels a little too slippery. The tip is hard plastic, rather than the rubbery stuff a lot of stylii use.