This British Standard specifies requirements for the construction,
for the accuracy at the reference temperature of 20 °C and for
the protection of metric and imperial precision vernier callipers
with external and internal contact faces. The standard specifies
requirements for metric callipers to measure lengths up to a maximum
of 1 000 mm using a main scale and a vernier scale graduated to read
to 0.02 mm and for imperial callipers to measure lengths up to a
maximum of 48 in using a main scale and vernier scale graduated to
read to 0.001 in.
This standard does not specify full requirements for callipers with an
electronic display, although the requirements for the beam, slider and
measurement faces may be the same as the vernier calliper.