Our coolest ruler, hands down. It’s dark blue plastic, T-shaped, and packed with information. It’s an American Wire Gauge and a screw-size gauge. It measures UTS and ISO screw pitch, has SMD capacitor info, conversion scales, transistor and diode diagrams. It has a list of SI prefixes, digital logic gates, logic identities, electrical units and abbreviations, colors and wavelengths, transmission line equations, a protractor, a breadboard and tons more. If you’re not into that stuff, use it a 13”/33cm ruler. Measures 15" x 6-1/4” x 1/16" overall, and you might need a magnifier to read some of it. Made in the USA.

Our each is a package of (2) steel tech rulers. One is 6” x 1/32” for the first 2-1/2” then 1/64” for the next 1/2” then 1/16” for the last 3”. The other is 150mm x 0.5mm. Both have sliding markers/pocket clips, and both have mm:inch tables on the reverse side. You’ll need excellent eyesight.

No, these scales won’t tell you how much weight you’ve lost (you’re so disciplined!), but they will help you design something super-technical. Know why? ’Cause they’re architect’s and engineer’s scale rulers, from Helix, both (3)-sided in silver aluminum with color-coded sides. You pick: the architect’s with separate scales for 3", 1-1/2", 1", 3/4", 3/8", 3/16", 3/32" 1/2", 1/4" and 1/8" per foot, as well as a 12" ruler in 1/16" increments, all in U.S. standard; or the engineer’s, with 12", 1/10", 1/20", 1/30", 1/40", 1/50", 1/60" scales.

Says so right on the packaging. Measures (pun intended) 18” long x 1-1/2” wide. Has 1/32” increments for the first inch, then 1/16” on one edge and 0-45cm in 1mm increments on the other. Made in England of blue-tinted translucent plastic. (There is no legal penalty for using it at home or in a school.)