Calipers are devices for
measuring linear dimensions, this may be
the distance between two parallel faces
or a diameter. Calipers are used for internal
and external measurements.
Calipers come in many shapes and forms.
The machinists' caliper contains no measuring
scales but is used in conjunction with a
reference part or rule. Calipers that incorporate
a measuring scale include verniers, dial
indicators and digital calipers:
See also Measurement
Methods and Measurement