- 25 -
11
Appendix II: Abbreviation glossary
Modes
Prompts
Code and
abbreviation
Description
P1.0
pH
P1.1
Standard buffer solution
P1.2
Due for calibration
P1.3
/
P1.4
Distilled water
P1.5
Distilled water mixed with
ammonia
P1.6
Factory default setting
P4.0
Basic
parameters
P4.1
/
P4.2
/
P4.3
Backlight
P4.4
Auto power-off
P4.5
Clear readings
P4.6
/
P4.7
/
P4.8
/
Others
China
United States of America
NIST
Off
On
No
Yes
12
Appendix III: Self-diagnosis information
Icons
Self-diagnosis information
Wrong pH buffer solution or the buffer solution out of range
Press key when measuring value is not stable during calibration.
During calibration, the measuring value is not stable for ≥3min.
pH electrode zero electric potential out of range
（
<-60mV or >60mV
）
pH electrode slope out of range
（
<85% or >110%
）
Enter in pre-set calibration date to remind calibration
