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3. Press and release ON/OFF. Screen will show 'rSt' and 'nO' flashes.
4. Press CAL to select: 'nO' retains values; 'YES' resets the meter.
5. Press HOLD/ENT to confirm.
Temperature Calibration:
1. Press ON/OFF
2. Press HOLD/ENT, the meter will go in Hold mode.
3. Press CAL for few seconds to select °C or °F.
4. Release CAL to confirm. Upper display flashes.
5. Dip the tester into a solution of known temperature and wait for the temperature to stabilize.
6. Press HOLD/ENT to set the temperature value.
Note: To abort calibration, press CAL.
Electrode Maintenance:
1. Rinse with clean water after each measurement. DO not wipe or dry the glass sensing bulb.
2. In aggressive chemicals, dirty or viscous solutions and solutions with heavy metals or proteins, take readings quickly and
rinse electrode immediately.
3. Keep a piece of paper or sponge in the cap, moistened with clean water, electrode storage solution or pH 4 buffer. (NOT de-
ionized water or pH 7 buffer).
Changing Batteries
(performance can be improved when 1 bar battery life remaining)
1. Open battery compartment lid. Remove old batteries noting polarity (flat side of battery is +).
2. Replace with (4) fresh ones. LR44 or A76 batteries
Electrode Replacement:
necessary when calibration fails or when readings are erroneous in
new calibration standards with hydrated electrode sensor and fresh batteries.
1. Grip the ribbed collar with electrode facing you. Twist the collar counter clockwise (Fig A).
Save the ribbed tester collar and O-ring.
2. Pull the electrode off the tester.
3. Align the 4 tabs on the new module with the 4 slots on the tester (Fig B).
4. Gently push the new module onto the slots.
5. Push the smaller O-ring fully onto the electrode.
6. Push the collar over the module and twist it clockwise.
Note: Recalibrate your tester after electrode replacement.
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