4
3.3
Hold
until screen turns green. The pen starts automatic
calibration. Wait for "Good" to show up (in 10-15 seconds),
indicating the calibration is completed, then the pen returns to
measurement mode.
Short press any key while calibrating (in green screen) to cancel
calibration and return to measurement.
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.
