KERN PFB 120-3A Operating Manual page 26

Display and edit sum „Total":
 When the balance is unloaded (zero display) press the PRINT key, the number of
weighings, followed by the total weight will be shown for 2 sec and printed if an
optional printer is connected.
Delete sum memory:
 With the weighing scales unloaded (zero display) press the PRINT key, wait for
display of "total weight" and press the PCS key. The data in the summation
memory are deleted.
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Printout example (KERN YKB-01N):
1: 100.00 g N
2: 200.00 g N
- - - - - - - - - - - - - - - - - - -
1-2: 300.00 g C
First weighing
Second weighing
Total weight
PFB-BA-e-1741