Amphenol PROTIMETER Digital Mini Manual De Instrucciones página 11

Backlight Settings:
Once the Buzzer settings are entered, the next setting turns the
Backlight ON or OFF.
To change the settings, press the button.
If the unit detects no key press for 2 seconds in the Setting
screen, it moves to the next setting.
Pressing the button, after you have entered the desired
setting, will save the setting and move the screen to the next
setting.
Protimeter Digital Mini Page 9