Extech Instruments TB400 User Manual page 6

Calibration Clear Procedure
1. The calibration clear procedure will clear all calibration values and return the meter to
default settings.
2. Power ON the meter with the cover closed but no testing bottle in the chamber.
3. Press the "CAL" button continuously until the LCD displays "CAL"
4. Wait one second; the LCD will then display:
5. Momentarily press the "HOLD" button. The LCD will display:
6. Momentarily press the "HOLD" button again. The LCD will display:
7. Momentarily Press the "CAL" button. The LCD will flash "CAL" for 10 seconds:
8. The calibration data clear is complete. The meter will return to normal operating mode.
800.561.8187
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CAL
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