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Humidity Calibration
1.
With the meter OFF, plug the humidity sensor probe into the 33% Calibration Reference bottle.
2.
Simultaneously press and hold the START-STOP and the SET buttons for at least 2 seconds
to enter the 33% Calibration mode. The display '32.8%' will begin to flash on the display.
3.
Approximately 30 minutes later, the '32.8%' display will stop flashing, indicating that the 33%
calibration is complete
4.
Plug the humidity sensor probe into the 75% Calibration Reference bottle.
5.
Press and hold the START-STOP button for at least 2 seconds to enter the 75% Calibration
mode. The display '75.3%' will begin to flash on the display.
6.
Approximately 30 minutes later, the display will stop flashing, indicating that the entire
calibration is complete. The meter will automatically return to the normal operating mode
Calibration Notes:
•
The user can exit the calibration without finishing by pressing the START-STOP button for
2 seconds (before reaching step 6 above).
•
For best accuracy, perform the calibration at room temperature.
•
Calibration Reference bottles are available optionally through Extech Instruments
distributors
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12
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42280-EU-EN-V4.4-12/11
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