No You Can Get It Right The First Time
This world is getting so techno-advanced, now even the lowly bolt is getting into the act. Behold the Smartbolt, fitted with a tiny indicator disk on top that shows you just how tight it is. There’s nothing electronic about it – it’s a visual tension indicator that starts out red and turns more black as you tighten it. There’s a more-precise version that goes from yellow to green when 90% tight, turning black at 100%.
This is a useful invention, showing you the actual tightness of a bolt rather than relying on a torque wrench’s measurements, which can be off by as much as 30%. Plus, you can tell if you’re just too much of a wimp to tighten that bolt the whole way. Reassuring stuff. Now we need Phillips-head screws that can do this trick, too.