Westcott Triangular Scale (KT-90), (Pack of 2), clear, 11 x 5.75 x 0.25 inches

Probably not for serious drafting, but for casual use these are good. Straight edges, handy size, and made from the 'right' kind of plastic - slightly flexible, hard and thick enough to be durable, not hard enough to be brittle and easy to chip. Beveled on one side for inking (we used to do that by hand, kids). I prefer the 'step' inking edge - it's better for using two triangles together - or none at all, but these are a good value for the money, and you can use them with the occasional ballpoint and not scar them permanently.

One edge in metric. Other in inches

Very good set for a primary school kid. The only reason I'm not giving it 5 stars is because one of the triangles has a rugged edge section, it is hindering the performance - the line comes out uneven, with little bumps. Tried sanding it down a little which helped smooth out the surface, but not completely perfect.

They fit in my supply box I take to my Zentangle class, which was a priority They are sturdy and easy to handle. Marks are easy to read.

Needed for sons school... 2 different triangles angles were needed. Plastic but should hold up. Nicely priced and easy shipping

Works, nice construction. The edges are all nice and straight and polished.

I bought 2 sets of these for a drafting class. They’re the perfect size, just the right sturdiness, smoked color so it’s super easy to see through them but also easy to see the edge (I think it’s harder to work with clear tools), and they were super inexpensive. The issue? On each set, on the 30-60-90 triangle, there’s a flaw in the edge. If you’re using them with a T-square to draw vertical lines you have to remember not to use that edge or you end up with a jiggety line. Thank heavens I discovered it when I was working with pencil, not ink, or I would have had to trash the entire drawing. It’s not obvious enough that it catches your eye, but it sure is obvious enough to catch your pen/pencil.

Why don't these triangles have inking edge on the marking sides? But made inner cutout with inking edge is not useful. Also hope the zero measurement mark could be located precisely at the very beginning of the corner so that makes it easily line up the edge of the ruler directly with the edge of the object. Attached is a result of ink smearing to drawing lines with it and another one with double inking edge.