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Step 1: Power on – Connect the power supply; the conductivity measurement interface will appear. Program as needed and set the parameters. 2 Conductivity sample calibration a) Press the “Exit” button on the measurement interface to enter the protection password screen; enter the password, then press the “Confirm” button to go back to the main menu. Select “Instrument Calibration” and press “Confirm”. b) Enter the instrument calibration menu, select conductivity sample calibration, and press the “Confirm” button. c) Perform single-point calibration of the instrument using a sample solution with a known conductivity value. Enter the sample’s conductivity value and press “Confirm”; once calibration is successful, the instrument will automatically return to the calibration menu. Press the exit button repeatedly to return to the measurement interface. 3 Water sample measurement: a) Wash the electrode at least twice with the water sample to be tested; b) Then take another sample of the water to be tested, insert the electrode into the beaker, and wait for the measurement value to stabilize (about 30 seconds); c) Once the stability indicator shows that the value has stabilized, the measurement value can be read. 4 Precautions: a) If the conductivity value of the water sample is low, the electrodes should be cleaned several times to obtain more accurate measurement values. b) Exceeding the measurement limits is strictly prohibited. If the conductivity value of the water sample exceeds the measurement range of the electrode being used, it can cause electrode polarization, reducing the accuracy of the electrode’s measurements and ultimately leading to its failure. 5 Instrument maintenance a) When the instrument is not in use temporarily, simply immerse the electrode in pure water. The instrument and beaker should be kept dust-free to avoid affecting precise measurements. b) If the instrument is not used for an extended period of time, it should be powered off, the electrodes removed, pure water added to the electrode protection bottle, and the instrument stored with that protection bottle. c) Clean the conductivity electrode with a soft paper towel.