Figure 2-49.Dial indicator and attachments.
Keep clean and lightly oiled. (Do not oil dial
Always wipe an instrument clean of fingerprints
before returning it to the box.
Always verify an instruments accuracy before
using it by checking its calibration sticker.
Have a precision instrument calibrated accord-
ing to PMS, when one has been dropped or when you
are in doubt about the accuracy of one.
Always allow the temperature of a precision
instrument to equalize with ambient temperature to
ensure accuracy of measurements.
Return to the box a precision instrument not in
Never store a precision instrument with other
tools such as wrenches, hammers, and so on.
Never carry a precision instrument in your
pocket unless it has an appropriate pocket carrying case.
Never close a precision instrument such as an
outside micrometer, vernier caliper, or dial indicator
tight for storage. Temperature changes can cause
frames, spindles, and so on, to become distorted.
Never open or close a micrometer by twirling
Never attempt to remove mill shavings or dirt
from a precision instrument with an air hose. This
procedure only embeds small particles into the working
Never attempt to calibrate a precision instru-
ment yourself. Always send it to an authorized calibrat-
Never attempt to clean measuring surfaces with
Never force a precision instrument to attain a