STEP SYSTEMS Nitrachek 404 Operation Manual page 10

Calibration – Dipping
Open the hatch. The display briefly shows 8 8 8 8, then "CAL"
Lot number flashes.
Insert test strip in strip carrier
Pad downwards and facing the towards the meter body.
Close smoothly the hatch . Sign " - - - " displays.
If calibration is accepted, the meter beeps twice and displays "GO"
If not, "Err" is displayed
st
1 beep : dip the strip
Only when everything is ready, open the hatch.
st
Exactly at 1 beep, dip test strip in solution.
Dipping lasts for 2 seconds exactly, not more, not less,
st
beetween 1 bip and 3
rd
3 beep : remove
Dipping duration = 2 seconds exactly
rd
bip (longer beep)