Wohler KM 410 Mode D'emploi page 58

Calibration
12 Calibration
The meter is calibrated at standard 400 ppm CO
ed to do manual calibration regularly to maintain good accuracy. It takes about 10
minutes to calibrate the meter.
ATTENTION!
After a long time usage or under special conditions, return the meter to the factory for
standard calibration.

The manual calibration is suggested to be done in fresh outdoor air that is well ven-
tilated and in sunny weather. Switch the meter off and place it in the calibration site.

First press START/ESC and MEM/▼, then also ON/OFF/SET simultaneously for 3
seconds to turn on the meter and enter the calibration mode.
Three calibration menus are available: CO
58
concentration in factory. It is suggest-
2
, relative humidity, CO
2