Klein Tools 910-6 Folding Ruler 6-Foot, Durable Fiberglass, Inside Reading

I'm an electrical engineer and needed a ruler for work around electrical equipment. This ruler is all nylon-reinforced fiberglass and, per Klein, is non-conductive. There is a small stainless steel spring at the joint for each segment, but it's recessed and unlikely to touch anything dangerous. The ruler segments open nicely with a little effort and will snap into either 90 degree or 180 degree positions. I prefer the inside reading rulers as I am measuring against a panel surface or wall most of the time, and that means the extended part of the ruler that starts at "0" lays flat against the surface. The folded ruler is 8 inches long, 2 inches wide, and 3/4 inch thick, easily fitting into a back pocket. Being fiberglass, it's easy to clean, is waterproof, and shouldn't pick up any stains from normal use. The numbers and lines are engraved, so no chance of wearing off over time. A red stud marking is included every 16 inches. The ruler is a full six feet long; when fully extended it will bend a little if held flat side up, but doesn't bend at all if used edge-up. If used in the rain, I've found that a little moisture can be trapped when folded up, so make sure to open and dry after you're back inside. Overall an excellent measuring stick for all conditions.

Excellent

Todo a la perfección. Saludos

I did a lot of research on folding rulers and decided to spend a little extra money for a quality item. This is it! Klein Tools made such a high-quality folding ruler with very clear markings so that I know this will last me a long time. It is not fragile so that you would fear of it snapping. I rather spend more money on buying a quality item that will last me a long time rather than having to buy another one because the quality is so poor and it breaks on me.

Joints are tight, form an actual 90 deg when locked, easy to read