9OPERATIONAL GUIDEINITIAL PREPARATIONThe instrument is supplied complete with 1.5V AA (4 pcs.) batteries. For placing the batteries insidethe meter, see page 42.Make sure that the protective micro USB cover is used when not connected to a computer to ensurewaterproof protection.For HI98163 connect the pH/temperature electrode to the DIN connector.Turn the instrument ON by pressing ON/OFF key.At start‑up the display will show the Hanna logo for a few seconds followed by the percentageindication of the remaining battery life, then enters the measurement mode.After measurement switch the instrument off, clean the electrode and store it with a few drops ofHI70300 storage solution in the protective cap (see page 45).The Auto Power Off feature turns the instrument off after a set period (default 30 min) with no buttonpressed to save battery life. To set another period or to disable this feature, see SETUP menu onpage 23.The Auto Light Off backlight feature turns the backlight off after a set period (default 1 min) withno buttons pressed. To set another period or to disable this feature, see SETUP menu on page 23.pH MEASUREMENTSTo take a pH measurement remove the electrode protective cap and simply submerge the tip of theelectrode (4 cm/1½") into the sample to be tested.Press RANGE key to choose between pH and mV ranges.Use MODE key to select the pH resolution.Allow time for the electrode to adjust and reading to stabilize (hourglass symbol turns off).