The display show the status of automatic power-off function.
If the display shows “PR ON", it means that the automatic
power-off function is working. If the scale shows "ZERO" and do not
work after 2 minute, the scale would be power-off automatic. If the
display shows “PR OFF”, it means that the automatic power-off
function is closed.
You could use [TARE/ZERO]button to change the status of this
function just like the following picture. After that, you could press
[UNIT] button to move across the "Backlight function"
3.2 Backlight
This function is used to choose the value of backlight, the
display shows "BL value "The value include 3 level(1~3).Press
[TARE/ZERO] button to choose the level.
"1"means the backlight is closed.