640 says "CAN'T" When Trying to Zero

640 says "CAN'T" When Trying to Zero

The 640 is in Net mode and can only be zeroed in Gross mode.
Press G/N to return to Gross mode, then press Zero.
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Qualification:

  1. Any scale brand and scale model qualifies. 
  2. Any condition qualifies.  (Yes even broken scale indicators)
  3. Any age of scale indicator qualifies (Yes even 40 year old scale indicators)
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