User Guide

16
recalibrate the value.
Note: If a single point cali-
bration is required,
press CAL to leave
the calibration mode
now. However, it is
always better to proceed as follows
for a two-point calibration.
• “10” can be changed to “4” (indicating
pH 4.01) by immersing the electrode and
the temperature probe into the pH 4.01
buffer. If you are measuring acid samples
(pH 7 or less) use the pH 4.01 buffer
(HI7004/HI8004). For alkaline samples (pH 7
or more) use pH 10.01 (HI7010/HI8010).
• Rinse the electrode with some pH 10.01
(HI7010/HI8010) or pH 4.01 (HI7004/HI8004)
solution. Dip the bottom 4 cm (1½") of the
electrode and the temperature probe into a
beaker containing the second buffer.
• When “10” (or “4”) stops blinking, indicat-
ing that the electrode has stabilized, wait
30 seconds and then press CFM again to
CAL
CAL
4 cm
(1½
")
HI 7010
4 cm
(1½
")
HI 7010