vernier caliper is a precision instrument equipped with two sets
of jaws, one for making internal measurements, the other for making
extermal measurements. These jaws should be closed lightly on the
object being measured. Some vernier calipers also have a depth gauge
section. This is a probe, attached to the movable head, which slides
along the center of the body and is thin enough to be inserted in
deep grroves that may be inaccessible to other measuring devices.
A depth gauge section is particularly useful in automotive applications
for tasks such as checking the drive train end-float in a final
drive assembly (when it is used in conjunction with an engineer's
A vernier caliper usually includes both imperial and metric scales
and is accurate to about one thousandth of an inch, or 0.02 millimeters.
This tool should be handled carefully and stored in a clean, dry
An even more precise instrument used for similar purposes is the