Dakota Ultrasonics UMX-2 - Manual (Page 40)

UMX-2 Underwater Material & Coating Thickness Gauge
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2) When UMX-2 is displayed, immediately press and release the button to
enter the sub menu options. Again, the options will begin scrolling in a
continuous loop (LT ON, LT OFF, LAUTO, MEM ON/OFF, UPGRAD).
3) When the desired light option is displayed, immediately press and release
the butto n to set the option in the UMX-2. For this example, LT ON has
been selected.
4) Press and hold the button to escape out of the sub menu options at any
time.