Industrial designers, machinists, scientists, etc ... they all use vernier callipers to make high-precision measurements of distances between two symmetrically opposing sides. It is highly recommended that IDES students equip themselves with vernier callipers in their design studio toolkits.The above Java applet by Ron Blond of Alberta Learning Canada trains students in reading vernier callipers.
Another website, from the Physics Department of Clemson University, also provides video tutorials on how to read verniers.
And this web simulation from Southern Methodist University tests students on their vernier reading skills.
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