The instrument can now be calibrated and used. See section 5.0 for pH calibration procedures. Turn the
front switch to ON for use.
Analog face-6" mirror-backed analog display for pH and millivolt readings.
OFF: Power to instrument is off.
mV: Millivolt-meter will display millivolt input from oxidation-reduction (ORP) or pH electrode.
pH: Meter will display pH input from pH electrode.
SET Calibration knob used for first point in two point calibration usually pH 7.00 buffer.
It can also be used for millivolt offset.
SLOPE Calibration screw used for second point in two point calibration, usually pH 4.00 or pH 10.00 buffer.
NORM-EXP Toggle switch that allows meter display in normal (NORM) mode 0-14 pH units, 700 mV or
expanded (EXP) mode-only 1.4 pH units, 70 mV.
ZERO Used for standard input of zero millivolts. When the button is depressed, the meter should read zero
millivolts. The reading can be adjusted using the SET knob. Establishing zero millivolts is especially important when the
instrument is used in the expanded mode.
TEMP Temperature compensation knob when this knob is set to the sample temperature, the pH readings
are temperature compensated. Note: All temperature settings are in degrees centigrade.
BNC Connector The connector for the BNC fitting of an ORP or pH electrode.
Mechanical Zero Screw used to adjust meter needle to 0 starting position when meter is3 OFF.