Press the "Calibrate" button and wait. The screen should flash "Calibration Successful"; otherwise repeat steps 1-2.
Proceed to wet calibration.
Wet Calibration
Place the probe in the conductivity solution, and stir it to remove trapped air.
Press the "Calibrate" button and wait. The probe will take readings until it gets less than a 40% variance for two consecutive readings. The screen should flash "Calibration Successful"; otherwise, repeat steps 1-2.