BNC 1201 - 6 1/2 Digit Digital Multimeter - Manual (Page 106)

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4.4.11 Calibration
1201 will show the latest calibrated date and the next calibration date on
the display after following the operation below. The location of the
buttons is shown with red rectangle frames in Figure 4-37.
How to see the calibration information
Press MENU then locate “CALIBRATE” option using ◁ and ▷. Press
ENTER to select it. Use ◁ and ▷ to switch from the last calibrated date
and the next calibration date.
Figure 4-37
4.4.12 Self-test
Self-test procedures are built in 1201 for checking that the logic and
measurement hardware are functioning properly. Every time when the
multimeter is powered on, a set of test procedures is performed to make
sure the basic function of the multimeter works properly. If any error
occurs during self-test procedures, it indicates that parts of the
multimeter are not operating properly and need to be serviced.