- 12 -
Display similar
readings in any
solutions or
always display
7.0 pH
Broken probe
If you don’t find any visible damage of the probe,
contact us for warranty fulfillment; If there is visible
damage, replace the probe.
Reading keeps
jumping
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
Aged probe
Replace the probe.
Air bubbles around the
sensor
Make a quick stir in the solution to remove air
bubbles.
Clogged junction
Clean the probe with cleaning solution, then soak it
in 3M KCL soaking solution overnight.
Comparison with other
testers, test strips, or drop
tests
To compare with other testers, make sure to
perform a 2-point calibration for all testers in the
same standard, then test a 3rd point. Whichever
gives more accurate reading is the more accurate
one. Test strips or drop tests’ accuracy is not
comparable to pH meters ‘.
16. Warranty
We warrant this instrument to be free from defects in material and workmanship and agree to repair
or replace free of charge, at option of APERA INSTRUMENTS (Europe) GmbH, any malfunctioned or
damaged product attributable to responsibility of APERA INSTRUMENTS (Europe) GmbH for a period
of TWO YEARS (SIX MONTHS for the probe) from the delivery. This limited warranty does NOT cover
any damages due to: accidental damage, unauthorized repair, normal wear and tear, or external
causes such as accidents, abuse, or other actions or events beyond our reasonable control.
APERA INSTRUMENTS (Europe) GmbH
Wilhelm-Muthmann-Straße 18, 42329 Wuppertal, Germany
