Pressing too soon
(Showing Er2)
Wait for to stay on screen before pressing .
Poor quality standard
solutions
(Showing Er1)
Replace with fresh and clean standard calibration solutions
made by legitimate scientific instrument manufacturers.
Contaminated sensor
(Showing Er1)
Use a soft brush to clean the probe with Apera probe cleaning
solution or detergent water.
Incorrect calibration order
(Showing Er1)
Reboot tester, calibrate pH 7.0 first, then pH 4.0. For details
refer to calibration notes (a).
Broken probe
(Showing Er1)
If you don’t find any visible damage of the probe, contact
Apera for warranty fulfillment; If there is visible damage,
replace the tester.
Dried-out probe
(Showing Er1)
Soak the probe in Apera 3M KCL solution for at least 15
minutes.
Probe is not fully submerged
solution
(Showing Er1)
Make sure the probe is fully immersed in the solution at least
1 inch deep.
Air bubbles around the
sensor
(Showing Er1)
Make a quick stir in the solution to remove air bubbles.
Reading is
always slowly
changing, won’t
stabilize
Use a soft brush to clean the probe with Apera probe cleaning
solution or detergent water.
Use a soft brush to clean the probe with Apera probe cleaning
solution or detergent water, then soak it in Apera 3M KCL
soaking solution overnight.
Testing pH of low ionic
strength solutions like
tap/drinking/RO/distilled
water
Be patient, wait for 1-5 minutes to reach a fully stabilized
reading. If still not stabilizing, add Apera 3M KCL solution to
test water at 1:1000 ratio.
Display similar
readings in any
solutions or
always display
7.0 pH
If you don’t find any visible damage of the probe, contact
Apera for warranty fulfillment; If there is visible damage or the
probe is more than 6 months old, replace the tester.
Contact us for warranty fulfillment.
Probe is not fully submerged
in the solution
Make sure the probe is fully immersed in the solution at least
1 inch deep.
Air bubbles around the
sensor
Make a quick stir in the solution to remove air bubbles.
Probe is not properly
connected, or the pin
connector is broken.
Check the probe’s connector, make sure it’s not broken and is
correctly connected. Align the probe and instrument correctly
before plugging in. Never force it. Ensure that the probe
connector is not exposed to air too long.
Calibration is
successful, but
reading is not
accurate
Air bubbles around the
sensor
Make a quick stir in the solution to remove air bubbles.
Clean the probe with Apera probe cleaning solution, then soak
it in Apera 3M KCL soaking solution overnight.
Comparison with other
testers, test strips, or drop
tests
To compare with other testers, make sure to calibrate all
testers in the same pH 7.0 solution, then test pH 4.0.
Whichever gives more accurate reading is the most accurate
one. Test strips or drop tests’ accuracy in not comparable to
pH meters‘.
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