Casella CEL CEL-450 - Manual (Page 11)

At the end of the self test sequence, the instrument displays
memory information and battery voltage,
followed by the identity of the last used setup.
Finally it enters calibration check mode (described in Chapter 2).
Current date and time
Last used setup
Inst. Type 450/490
Inst. Version A = Broadband
B = Octave band
C = Third octaves
1 = Class 1
2 = Class 2
Firmware version
Program version and issue
Interface status
Inst. identification number
The dates and times of the last 4
calibrations are stored.
See Section 2.2.
Introduction
CEL-450/490 Operators Handbook - Page 11