LW Measurements HRB 1002 - 1000g x 0.01g - Manual (Page 19)

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4.2.2.12 Setting Backlight
Press ON/OFF key, and when
“- - - - - - “shows, press TARE key, and then press ZERO key multiple times
till display shows “L ON”, “L OFF” or “ L AU”, Press UNIT key to select backlight to be “On”, “Off” or “Auto”.