I turned 50 back in August and the 'ol eyes aren't what they used to be. Using a ruler to measure things leads to a hell of a lot of squinting and frustration.
Back in previous life as a research biologist, I was assigned a lab coat, safety glasses, and a caliper.
And I though to myself that a caliper would be great for measuring stamps, mounts and all sorts of other cool things.
I did some Amazon
searches and found calipers ranging from $10 to as high as $215. I thought the $10.00 is probably all that I need. But I never got around to ordering it.
Fast forward a few months, and I am walking through Harbor Freight Tools picking up needle nose pliers I need to fix an aquarium filter and low and behold, on the wall is a pair of digital calipers for $6.00!
The calipers are all plastic and do feel cheap. But for the kind of stuff I am measuring, they'll do just fine. I would not use these for any kind of precision work, but for quickly measuring stamps, mounts, aquarium tubing and other things were absolute precision is not necessary, they're just fine.