KERN CXB 30K2 Mode D'emploi page 88

9.2 Numerical input of tare (PRE-TARE)
Pre-setting PRE-TARE mode
Make sure that no load is on the weighing plate

Press the -button, in the reference weight display appears flashing [PrEtA]

During this display enter the Pre-Tare value using the numeric keyboard

Press button
The Pre-Tare value will be displayed as a negative value.
In the menu select the menu item „FnC 10":

Use the keys
PRE-TARE setting "00" = no input of tare possible when weighing plate is loaded
PRE-TARE setting "01*" = input of tare weight possible regardless whether weighing
plate is loaded or unloaded
* = default setting
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or
to select the desired setting:
CXB-BA-e-2124