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Restore factory calibration parameters:
Press and hold the "-" button if you want to restore factory
calibration parameters.
When the LCD displays "RES", press the "SET" button to
confirm and then the factory calibration parameters are
restored.
Troubleshooting:
Do not touch the sensor or don't store the item in
packaging materials with strong smell, so as not to affect
the accuracy of the sensor.
WL 1020 should not be placed in a polluted environment
for a long time (eg: sealed boxes, contaminated
environments).
Before the WL 1020 is used, it should be placed in a well-
ventilated environment to work for more than 1 hours to
EN13
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