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The PRB-0 key is used to "zero" the DX-2 in much the same way that a
mechanical micrometer is zeroed. If the tool is not zeroed correctly, all of
the measurements that the tool makes may be in error by some fixed value.
Refer to page 133 for an explanation of this important procedure.
The CAL key is used to enter and exit the DX-2's calibration mode.
This mode is used to adjust the sound-velocity value that the DX-2 will use
when calculating thickness. The tool will either calculate the sound-velocity
from a sample of the material being measured, or allow a known velocity
value to be entered directly. Refer to page 144 for an explanation of the
two CAL functions available.
The IN/MM key is used to switch back and forth between English and
metric units. This key may be used at any time, whether the tool is
displaying a thickness (IN or MM) or a velocity value (IN/µs or M/s).
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