12
LOW-BATTERY
When the battery voltage falls below the
measurement required range, shows
on the LCD. Replace with fresh batteries
to ensure accurate measurements.
2. During calibration, a CO2 reading in
the range of 380 to 420ppm will be
flashing on the upper display.(Fig.U)
Fig.T
Fig.U
ppm
NOTE:
Be sure the batteries are with full
voltage during the calibration to
prevent from interruption and fail
in the calibration.
1. While the meter is turned off, hold
down , and simultaneously
to enter CO2 calibration mode. It runs
30 seconds countdown with CAL at
lower display(Fig.T), and then starts
400ppm calibration.
3. Wait for 10 minutes until the reading
stops flashing, the 400ppm calibration
is completed and it returns to normal
mode automatically. .
To abort the calibration, turn off the
meter at any time.
