4
3.4
icon will show up on the lower left corner of the screen, indicating the pen is
successfully calibrated. Repeat Step 3.2 to 3.3 to calibrate pH 4
using 4.00 pH buffer, then
will show up next to
. You can
continue to calibrate pH 10 by repeating Step 3.2 to 3.3 using 10.01
pH buffer (sold separately), then
will show up to the right of
.
Calibrating pH 10 is usually not necessary unless your estimated target pH is greater than 8.0
pH
.
3.5
/
/
will disappear in 30 days after calibration, reminding
you to recalibrate the tester. We recommend calibrating pH at least
once a month to ensure accuracy. If you feel like the accuracy
might be off, simply test the standard buffers (make sure the buffers
are fresh and clean). If a discrepancy is found, then it’s time to
calibrate again.
3.6
If the calibration fails, the screen will turn red. For details, see
Section 13 Troubleshooting Guide.
Always perform at least a 2-point pH calibration to ensure accuracy. Start
with 7.00 pH, followed by 4.00 pH immediately. If you happened to turn off
the pen before calibrating 4.00 pH, you need to start with 7.00 pH again
after rebooting the pen, then 4.00 pH.
4
pH Measurement
4.1
Power on and remove the probe cap.
4.2
Rinse the probe with clean water and shake off excess water.
4.3
Fully submerge the probe into the solution at least 1 inch deep.
4.4
Hold the pen and wait for the reading to stabilize (
stays on screen),
then record the reading. Press
to lock the reading if necessary.
Press it again to cancel the lock.
4.5
After measurement, thoroughly rinse off the probe with clean water,
then put the probe back into the cap with 3M KCl storage solution.
