Avery Weigh-Tronix ZM303 User Instructions page 22

Indicator applications
3.
4.
5.
If enabled, press and hold PRINT for three seconds to print and/or clear the active
accumulator values. These functions are enabled or disabled in a password protected
menu.
22
Press PRINT to add weight to the accumulator and to print the selected print
format ...
The PRINT annunciator lights briefly.
Remove weight from the scale. Weight must return to inside the gross zero
band before another print and accumulation can be recorded.
Repeat steps 2 through 4 for each weighment you want to accumulate.
ZM303 Indicator User Instructions