Checkline DFX-7 - Manual (Page 80)

Dakota Ultrasonics
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3) Alternatively, press the ENTER key to display the Digits Edit Box.
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.