Dakota Ultrasonics UMX-2 - Manual (Page 7)

Dakota Ultrasonics
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1.3 Disclaimer
Applies to dual element transducers: Inherent in ultrasonic thickness measurement
is the possibility that the instrument will use the second rather than the first echo from
the back surface of the material being measured. This may result in a thickness
reading that is TWICE what it should be. Responsibility for proper use of the
instrument and recognition of this phenomenon rest solely with the user of the
instrument. Other errors may occur from measuring coated materials where the
coating is insufficiently bonded to the material surface. Irregular and inaccurate
readings may result. Again, the user is responsible for proper use and interpretation
of the measurements acquired.