Sper Scientific 850055 pH Meter - Advanced - Manual (Page 13)

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SETUP MODE
6. Press MN/MX/AV to enter P3.5 and view the offset val-
ue. The offset value is the mV value of pH 7 and the
default offset value is 0.0. The offset value will be
different after calibration. If the value is outside the
range of ± 60 mV, replace the probe.
P4.0 pH Calibration Buffer
This meter allows the selection of two different types of pH
buffers: NIST or CUSTOM. Selection of the proper buffer
type more accurately calibrates the probe to specific
requirements.
NIST buffer: (five settings)
pH 1.68, 4.01, 6.86, 9.18, 12.45
CUSTOM buffer: (five ranges)
pH 1.00-3.00, 3.50-5.50, 6.00-8.00, 8.50-10.50,
11.50-13.50
Select Buffer
1. Press SET for 2 seconds to enter setup.
2. Press ▲ to select pH buffer. “BUF” will appear on the
middle of the LCD and P4.0 will appear on the lower
portion.