Thank you for choosing the Elitech refrigerant scale. To use the scale correctly, please read over the manual first, especially the "safety notice".
It is suggested to keep the manual properly with the scale or in a place where you can refer to it conveniently.
"LAMP": Press to light the backlight and it will last for 10s. Press and hold for 3s to keep the backlight on all the time, the buzzer will beep once as an indication. Press again to turn off the backlight.