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.

Designers, engineers, hobbyists and makers searching for a combination aluminum scale ruler and pencil set may be interested in the unique ONE 3. Featuring a Pilot FriXion erasable pen fused with ...

Launched on Kickstarter, the Escala pen has a long, triangular cap that doubles as a scale ruler graded with imperial and metric scales. Aimed at architects and engineers, who use pens and rulers ...