Biogents BG-CO2-Timer Mode D'emploi page 52

End time 1
After setting up the first start time, press button 3. "E1"
(End time 1) appears in the display.
Set the end time with buttons 1 and 2 as described
previously.
E1
1
Increase time
2
Decrease time
Start set-up of
3
end time 1
3
1
2