If you use a caliper to measure dimensions you’ll know this, and a quick glance at its scale or digital display will be second nature. But if you aren’t fortunate enough to have the eyesight ...

You might wonder why [Kevin] wanted to build digital calipers when you can buy them for very little these days. But, then again, you are reading Hackaday, so we probably don’t need to explain it.

Vernier calipers come in both analogue and digital formats. The main difference lies in how the reading is displayed. Analogue calipers require the user to carefully read the main scale and ...