I bought some digital measurement calipers mainly as a tool for 3D printing, But I quickly learned that it was useful measuring other things – pipe diameters (inner and outer), screw diameters, small pieces of wood, and so on. If you’re interested in 3D printing or model making, I’d say getting one of these for $10 is a no-brainer.

from Boing Boing https://boingboing.net/2017/12/07/these-digital-calipers-are-on.html