Pic 6-1
2.Turning on/off the lights and backlights
In the power-on state, long press the button for 2 seconds, the lamp will turn
on, and the instrument backlight will be turned off; press and hold the button
for 2 seconds, the lamp will be off and the instrument backlight will be turned
on. The operation process is as shown in Pic 6-2: (lights on)