Temperature Calibration Your electrode features a built-in temperature sensor. The temperature sensor is factory calibrated. Calibrate your sensor only if you suspect temperature errors may have occurred over a long period of time or if you have a replacement electrode. 1. Make sure the electrode is attached to the 6-pin connector. The ATC annunciator will appear at the bottom right-hand corner of the LCD. 2. Switch the meter on. Press the CAL/MEAS key to enter conductivity or TDS calibration mode. The CAL indicator appears above the primary display. 3. While in conductivity or TDS calibration mode, press the MODE key to enter temperature calibration mode. The primary display shows the current measured temperature reading based on the last set offset and the secondary display shows the current measured temperature reading based on factory default calibration. 4. Dip the electrode into a solution of known temperature (i.e. a temperature bath). Allow time for the built-in temperature sensor to stabilise. 5. Scroll with the MI/▲ or MR/▼ keys to set the correct temperature value (i.e. the temperature of the temperature bath). You can adjust the reading in increments of 0.1 °C. 6. Once you have selected the correct temperature, press the HOLD/ENTER key to confirm. The meter will be calibrated and return to the measurement mode. NOTES: • To exit this program without confirming the temperature calibration value, DO NOT press HOLD/ENTER. Press CAL/MEAS instead. • If the ATC indicator does not light up, see SETUP menu Program P1.3 to switch it on. See page 40. • Since temperature readings affect the accuracy of conductivity / TDS measurements, it is strongly recommended to carry out a conductivity / TDS calibration after a temperature calibration is done. Fig