You might be seeking out a straight edge with the HAY Wooden Ruler, but you'll get that and something lovely to look at along with it. This collection of length measurers provides you with the repeated and evenly spaced lines that you require of it, yet these have been further defined by the alternating banding of colors.
The measuring sticks come with either perpendicular or diagonal stripes in hues of green, blue and gray with ends of red and orange. They help to indicate the spacing of each centimeter mark, and can be ordered to span either 20cm, 25cm or 30cm, according to your preference. The HAY Wooden Ruler are made from nice beech wood as a way to brighten up your desktop.