Made from solid brass, this very handy pocket vernier caliper features permanently engraved graduations in both metric and imperial units. The slide runs in a milled dovetail slot, providing a smooth action. With a measuring range of up to 80 mm, it is a nifty tool for measuring small objects. Each graduation on the main scale is 1 mm.
Calipers without a vernier scale originated in ancient China. The secondary scale, which contributes extra precision, was invented in 1631 by Pierre Vernier, a French mathematician and instrument inventor. Readings from a vernier caliper are expressed to two decimal places of a centimeter. The main scale contributes the main number and one decimal place, the vernier scale contributes the second decimal place to the reading. You can find a quick guide on how to read a vernier caliper here.
Vogel Germany also offers a brass vernier caliper with a measuring range of up to 100 mm.