10
Display similar
readings in any
solutions or
always display
7.0 pH
Broken probe
Make sure the soil is wet. Testing in dry soil will damage the
probe. If you don’t find any visible damage of the probe and it’s
within the 1-year probe warranty, contact your point of purchase
for warranty fulfillment; If there is visible damage or the probe is
more than 1-year old, 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 in the air too long.
Calibration is
successful, but
reading is not
accurate or
consistent
Contaminated probe
After each measurement, make sure to use a soft brush with
water to clean off all the dirt on the probe, especially the white
PTFE junction ring. Avoid wiping or rubbing the blue spear tip.
Soil difference
Soil in different locations and different depth will have slightly
different pH values. Even when the angle at which you stick in
the probe is different, the measurement can also be affected.
Therefore, selecting multiple locations and sticking in the probe
at the same depth and angle, then calculating the average is
the best way to maximize accuracy.
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 standards, then test a 3rd
point. Whichever gives more accurate reading in the 3rd point
standard is the most accurate one.
Test strips or drop
tests’ accuracy is not comparable to pH
meters’.