KERN and SOHN PNJ Mode D'emploi page 120

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4. Change reference quantity
Select the desired reference quantity using the TARE-
key, e.g. 30 items. You can choose
Important:
The higher the reference quantity the higher the
counting exactness.
5. Weigh-in reference parts
Place as many pieces to add-up as required by the set
reference piece number.
Use the SET key to confirm.
6. Reference optimisation
For reference optimisation place again the same
quantity of counted pieces.
PNJ_PNS-BA-e-1612