Dakota Ultrasonics DFX-7 plus MANUAL1 - Manual (Page 33)

DFX-7 Ultrasonic Flaw Detector
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4) Press the UP and DOWN arrow keys to scroll the highlighted value.
5) Press the LEFT and RIGHT arrow keys to scroll the digit locations.
6) Repeat steps 4 & 5 until the GAIN value is correctly displayed.
7) Press the OK key to return to the measurement screen, or ESC to cancel
entering the GAIN.