Apera Instruments Gro Star AI102G User manual
Contents
Thank you for choosing Apera GroStar®
01
02
03
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04
05
07
06
7.3
08
10
09
① Loosen the battery cap lock.
② Pull off the battery cap.
③
④
⑤
⑥
⑦
⑧
11
12
13
Trouble Reason How to x
Cannot calibrate
Incorrect calibration order
Power on the tester, calibrate pH7 rst, then pH4. After pH4 is
calibrated, if you want to calibrate pH7 again, you need to reboot
the tester.
Poor quality standard
solutions
Replace with fresh and clean standard calibration solutions
made by legitimate manufacturers.
Contaminated probe Clean the probe with Apera's cleaning solution or detergent
water.
Aged prode Replace the probe.
Dried-out probe Soak the probe in clean water for 30 minutes.
Probe is not fully submerged
in the solution
Make sure the probe is fully immersed in the solution at least 1
inch deep.
Reading is
always slowly
changing, won't
stabilize.
Contaminated probe Clean the probe with Apera's cleaning solution or detergent
water.
Clogged junction Clean the probe with Apera's cleaning solution, then soak in 3M
KCL soaking solution overnight.
Aged probe Replace the probe.
Testing pH of low ionic
strength solutions like tap
water, drinking water, RO
water, distilled water
Be patient, wait for 1-5 minutes to reach a fully stabilized
reading. If still not stabilizing, add 3M KCL soaking solution to
your test water at 1:1000 ratio(e.g. 1ml to 1000ml or 1 teaspoon
to 1 gallon)
Display similar
readings in any
solutions or
always display
7.0 pH
Broken probe
If you don't nd any visible damage of the probe and it's within
the 1-year probe warranty, contact your point of purchase for
warranty fulllment;
If there is visible damage or the probe is aged, 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.
Probe is not properly
connected or the pin
connector is broken.
Check the probe's connector, make sure it's not broken and is
connected. Align the probe and instrument correctly before
plugging in. Never force it.
Ensure tha the probe connector is not exposed in the air too long.
Calibration is
successful, but
reading is not
accurate
Contaminated probe
After each measurement, make sure to use a soft brush with
water to clean o all the dirt on the probe, especially the white
PTFE junction ring. Avoid wiping or rubbing the blue spear tip.
Dry soil
Make sure the soil is wet. If the soil is dry, pH test cannnot be
performed, and the probe can be damaged. For dry soil, please
add some distilled or RO water to moisten. Ideally, wait 24 hours
before measuring.
Soil dierence
Soil in dierent locations and dierent depth will have slightly
dierent pH values. Even when the angle at which you stick in
the probe is dierent, the measurement can also be aected.
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.
Clogged junction Clean the probe with cleaning solution, the 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 calibrate at the
same pH7 standard, the test pH4. Whichever gives more accurate
reading is the more accurate one.
Test strips or drop tests' accuracy is not comparable to pH
meters'.
14
Range 0.0-14.0 pH
0-50℃（32-122 ℉）
Resolution 0.1 pH，0.1℃ /0.1 ℉
Accuracy ±0.1 pH，
±0.1℃ /±0.1 ℉
Temperature compensation Automatic
Calibration Automatic 1 to 3 points (7/4/10)
*pH 10.01 solution sold separately
Unit pH, ℃ , ℉
Power supply 4-AAA alkaline batteries
Backlight White（measurement）；Green（calibration）；Red（errors）
Reading hold Manual
Warranty Two years for the instrument, one year for the probe
pH probe LabSen® Spear Soil pH Probe
Successful calibration indicators M (7.00 pH), L(4.00 pH), H(10.01 pH)
Low battery reminder
Waterproof rating IP67
Reading stabilization icon
Range 0.0-14.0 pH
0-50℃（32-122 ℉）
Resolution 0.1 pH，0.1℃ /0.1 ℉
Accuracy ±0.1 pH，
±0.1℃ /±0.1 ℉
Temperature compensation Automatic
Calibration Automatic 1 to 3 points (7/4/10)
*pH 10.01 solution sold separately
Unit pH, ℃ , ℉
Power supply 4-AAA alkaline batteries
Backlight White（measurement）；Green（calibration）；Red（errors）
Reading hold Manual
Warranty Two years for the instrument, one year for the probe
pH probe LabSen® Spear Soil pH Probe
Successful calibration indicators M (7.00 pH), L(4.00 pH), H(10.01 pH)
Low battery reminder
Waterproof rating IP67
Reading stabilization icon
15
16
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