I have no idea why folding rules have gone out of style. For measurements under 6 feet, this is a cut over tape measure, etc. You can easily use it by one person without having to deal with tape that curls, twists, doesn't measure the inside angle, and keeps trying to get it out of your hand . don't make them the way they used to be; It really is an excellent tool. It's easier, safer, more convenient and more accurate. If you're measuring something 6 feet 6 inches or less, that is. As for the instrument itself: It is a very well built instrument. The high-impact polyethylene construction is built to last and the alignment markers are molded and painted for the perfect combination of visibility and durability. The connectors are spring-loaded and have stops every 90Β°, allowing them to be attached either vertically or in a straight line. They are very strong so the sections will not accidentally fold. They couldn't have been better. The 6" extension is a key feature and allows you to accurately measure internal dimensions, even in grooves and hard-to-reach places. The small slide that can be pulled out is well matched to the ruler and secured with a stopper to prevent it from getting lost. This also prevents the extension from slipping and losing dimension. A 5-star product from start to finish. If you've never used a folding ruler, treat yourself to this one. you will never return