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14. CAL Due Date:
The date for instrument calibration is shown on the top of the screen.
15. DB Scale Type Select:
The choices are Relative and Offset.
16. dB Offset Value:
Click to enter. Spin for values -1-10, Spin to the right for
values 1-40. Click to set and exit.
17. Battery Level:
Click to see how much charge is left.
18. System Shutdown:
This is where you can turn the UP401 off.