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6. Probe Cleaning
6.1 The tester is only as accurate as the probe is clean. Always thoroughly rinse off the probe before
and after each measurement with pure water in a container or with a wash bottle.
6.2 For tough contaminants, detach the sensor shield, soak the probe in Apera probe cleaning
solution (AI1166) or detergent water for 30 minutes. Then use a soft brush to remove the
contaminants. Afterwards, soak the probe in 3M KCL soaking solution for at least 1 hour. Rinse it
off, then re-calibrate the tester before using again.
7. Probe Storage
7.1 Always store the spear probe in the 3M KCL soaking solution when not in use. Never let it dry out.
Replace the soaking solution if it gets contaminated.
7.2 NEVER store the probe in pure water like tap, RO, distilled, or deionized water as they could
damage the pH probe. Pure water is only for rinsing the probe.
5.5 Pure Water pH Measurement
When testing pure water like tap water, drinking water, RO water or distilled water, it will take
longer for the readings to get fully stabilized (typically 1-5 minutes). Please be patient. If still
not working, add Apera 3M KCL (AI1107) to your pure water at the ratio of 1:1000 (e.g. 1 ml KCL
to 1000 ml water) to accelerate stabilization while minimizing pH change. If the accuracy is not
meeting your requirement, please contact us at [email protected] to find the specialized meter
designed for pure water pH test.
8. Parameter Settings
Symbol
Parameter Setting Contents
Code
Factory Default
P1
Select pH buffer solution
USA – NIST
USA
P2
Low value measurement alarm setting
0 to 14.00pH
0
P3
High value measurement alarm setting
0 to 14.00pH
14.00
P4
Select automatic lock
Off – On
Off
P5
Select backlight
Off - 1 - On
1
P6
Select temperature unit
℃ - ℉
℉
P7
Restore to factory default
No – Yes
No
8.1 Setup Menu
