Sper Scientific 860031 pH - mV Bench-Top Meter - Manual (Page 30)

30
PH PROBE CALIBRATION
7. If NIST is selected, the lower display indicates the value
of the solution at the current temperature.
Note...
If this secondary value continues to fluctuate, check the
buffer or probe. (Refer to TROUBLESHOOTING page 55).
If CUST is selected, the lower middle display indicates the
default, 2.00. Press HLD to select the buffer range needed.
Press ▲ or ▼ to adjust the lower middle display to coincide
with the main display reading.
8. When the measured pH value is stable and the Ready
function is enabled (Refer to P6.0 READY ICON page
25), “READY” will appear on the left side of the LCD.
Press
to confirm.
9. Change the buffer solution and repeat the previous
steps to achieve multiple point calibration. Clean the
probe in between each buffer.
10. Press ESC to return to Normal Mode.