A&D AD-4212A-100 Instruction Manual page 63

Switching the upper/lower limit values (3-level comparison)
1 Display the weighing mode.
2 Press the MODE key to select the
upper/lower limit value code.
3 Press the PRINT key to return to
the weighing mode.
Upper/lower limit value code
Weighing mode
Code C01
Upper limit value
Code C01
Lower limit value
Code C02
Upper limit value
Code C02
Lower limit value
or leave as is
Weighing mode
61