Have you RTFM?
Set up on a stable bench plug in and turn on. it will count down warm up time or should.
to calibrate, with nothing on the scale at all press cal/zero to zero the scale.
Then press and hold cal/zero "cal50" should display, place the 50 gram weight on the scale and press cal/zero.
scale should read 0.0 remove the weight scasle should read -771.6gr or -50.00g
Prerss cal/zero one more time to zero.
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