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P robe St orage
1) Under regular usage (daily or weekly use), make sure the probe cap is wet, and tightly close the cap with the O-ring.
2) For long-term storage (you are not going to use the product for a while), add 3M KCL soaking solution to the Fill
line in the probe cap and store the probe in it. Close on the probe cap tightly with the O-ring.
3) If you find white crystals inside or outside the probe cap, it is perfectly normal. It is the 3M KCL soaking solution that
crystalizes over time by its nature. Just rinse them off and add in new soaking solution. This chemical is not
poisonous nor dangerous, and the probe’s performance will not be affected at all.
4) NEVER store the probe in pure water like tap, RO, distilled, or deionized water as they could damage the pH probe.
If this happens, immediately soak the pH probe Apera 3M KCL soaking solution overnight, then re-calibrate it before
using. Pure water is only for rinsing the probe.
P arameter Setting
Table of Settings
Parameter Setting
1) When the meter is turned off, long press to enter parameter setting →short press to switch P01-P02…
→P8. Short Press , parameter flashes → short press to adjust parameter → short press to confirm
→Short press to exit parameter setting and go back to measurement mode.
2) Auto. Lock (P02) – Users can set the auto lock time from 5 to 20 seconds. For example, if 10 seconds is set, when
the measured value is stable for more than 10 seconds, the measured value will be automatically locked, and the
HOLD icon will be displayed. Short press to release the lock. When the setting is "Off" , the Auto. lock function
is turned off, that is, the measured value can only be manually locked. Short press to lock or unlock the
measured value. The HOLD icon will be displayed when reading is locked.
3) Auto. Backlight (P03) ─ Users can set the automatic backlight time for 1 to 8 minutes. For example, if 3 minutes
is set, the backlight will turn off automatically after 3 minutes; when the “Off” is set, the auto. backlight function will
be turned off, and short press to manually turn the backlight on or off.
Symbol
Parameter Setting Contents
Content
Factory Default
P1
Temperature Unit
˚C – ˚F
˚F
P2
Select automatic lock
5-20 seconds – Off
Off
P3
Automatic Backlight Off
1-8 minutes – Off
1
P4
Automatic Power Off
10-20 minutes – Off
10
P5
pH Buffer Series Selection
USA – NIST
USA
P6
pH Resolution
0.1 – 0.01
0.01
P7
pH Calibration Reminder
H-hours D-Days (set up in ZenTest App)
/
P8
pH back to factory default
No – Yes
No
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