GDM-397/GDM-461 User Manual
39
The BLUE button
It is used for selecting the required measurement function when there is more than
one function at one position of the rotary switch.
Turning on the Display Backlight (GDM-397 only)
Warning
In order to avoid mistakes arising from misread readings in insufficient light,
please use the backlight function.
Press and hold the HOLD/LIGHT button (yellow button) for over 2 seconds to
turn the display backlight on.
The display backlight will automatically turn off around after 10 seconds.
Sleep Mode (GDM-397 only)
To preserve battery life, the Meter automatically turns off if you do not turn the
rotary switch or press any buttons after 15 minutes.
The Meter can be “woken up” by turning the rotary switch or pressing any button.
To disable the Sleep Mode function, press BLUE button while turning on the Meter.
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