Temperature Calibration:
During the measurement, if the temperature reading displayed differs from that of an accurate
thermometer, you need to calibrate the unit.
1. Press and hold the CAL key for 3 seconds to enter setup menu.
2. Press ENTER key until unit
shows the “
o
C/CAL” or “
o
F/CAL”.
3. Press CAL key to enter the temperature calibration mode.
4. Press CAL key again to set temperature value (Resolution: 0.5
o
C).
5. Press ENTER key to confirm, the display shows next option.
6. Press ON/OFF key, the unit returns to measurement mode. Calibration is completed.
pH Measurement:
Rinse the pH electrode thoroughly with distilled water. Immerse the electrode into the sample
solution, stir the solution gently. Wait for the reading to stabilise; record the measured value as
displayed.
Hold Function:
The HL101 pocket pH/temperature tester contains two data hold modes. When the Auto-Hold
function is enabled, the unit will automatically sense a stable endpoint reading and freeze it; the
“HOLD” indicator appears on the display. If the Auto-Hold function is disabled, press HOLD key,
the unit will immediately freeze the currently displayed value. Press the HOLD key again to
resume measuring.
Enter
Hold
Meas
