GE XL VU Operating Manual page 106

Measurement
Types of Stereo Measurement
Length
A Linear (point-to-point) measurement.
PLACE ITEM. SELECTS NEXT ITEM.
INCH
A32
BLU
INDEX = 5.1 <5>
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Place the first cursor on the left image at the furthermost point of
measurement area by pressing the Freeze/Enter button. Place the
second cursor at the opposite end of measurement area to determine the
length of the feature or defect.
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106 XL Vu™ VideoProbe