Instruction Manual pH 5/6 & Ion 6173.5.2 Without Temperature probe (no ATC)If no temperature probe is used, the meter compensates for pH response based on anew calibrated temperature value manually set by you or at 25.0 oC (factory default).1. Press MODE key to enter into Temperature mode until “o C” shows in LCD.2. Compare the displayed value to NIST certified thermometer or thermometer knownto be accurate (dipped into a constant temperature bath).3. Press CAL key to enter temperature calibration mode. The LCD shows “CA”momentarily and displayed reading flashes. Note that this displayed value shouldeither be 25.0 oC or last set temperature value.4. Press S and T key (for Ion 6) or INC key (for pH 5/6) until the displays shows thedesired temperature. You can set any value from 0 to 100 oC.5. To cancel or abort this operation, press CAL key. Note no new value will be storedinto its meter‘s non-volatile memory. To confirm calibration, press ENTER key. TheLCD displays “CO” momentarily, and the meter reverts to measurement mode.