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Extremely rough surfaces such as the “pebble-like” finish of some cast
irons, will prove most difficult to measure. These kinds of surfaces act on
the sound beam like frosted glass acts on light; the beam becomes diffused
and scattered in all directions.
Rough surfaces also contribute to excessive wear of the probe, especially in
applications where the probe is “scrubbed” along the measurement surface
for use in the Scanmode. The probe should be inspected regularly for signs
of uneven wear on the probe surface (wearface). If this is detected, the
probe should be returned to the factory for repair or replacement.
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