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Reference
Range
Accuracy
ATC
Temp Display
Before you begin:
Hydrate electrode by immersing in electrode storage solution or clean water for 30 minutes.
Calibration:
1 point with any mV standard.
1. Press ON/OFF.
2. Dip electrode 2 to 3 cm into your calibration solution (Eg. 255 mV).
3. Stir and wait for the reading to stabilize (Approx. 1 – 5 minutes).
4. Press CAL. 'CAL' indicator will appear. Upper display shows the relative R.mV to be calibrated and the lower
display shows the default measurement.
5. Press and hold HOLD/ENT to scroll to the correct buffer value. Offset adjustment is up to ±150mV from the
default measurement.
6. Release HOLD/ENT to complete calibration. Wait for 5 seconds for automatic confirmation. The display shows
R.mV.
Note: To abort calibration, press CAL.
Measurement:
1. Switch the Testr on.
2. Dip the electrode 2 to 3cm into the sample. Stir and wait for the reading to stabilize.
Note: Sample temperature should be same as calibration standard temp if calibration was performed. For best
results, note sample temperature along with mV reading.
HOLD Function:
Freezes the display.
1. Press HOLD to freeze the measurement. 'HOLD' will be displayed.
2. Press HOLD again to release.
User Reset:
Resets the ORP calibration to the factory default.
1. Switch the Testr off.
2. Press and hold CAL.
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.
Electrode Maintenance:
1. Rinse with clean water after each measurement.
2. In aggressive chemicals, dirty or viscous solutions and solutions with heavy metals or proteins, take readings
quickly and rinse electrode immediately.
2 of 13
ORPTestr/ORPTestr10BNC
ORPTestr10
Ag/AgCl
-999 mV to + 1000 mV
±2 mV
No
No
ORPTestr10BNC
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