Laboratory Pen Ph Meter

Calibration: 1.Turn on PH meter 2.Disolve each buffer solution in 250ML of distilled water 3.Immerse the electrode into the PH 6.86 solution,(under the temperature of 25) 4.Press the “CAL”(calibration)button for 5 seconds and release -Display will start flashing 6.86 -Wait until the display stops flashing. Rinse the electrode with distilled water and dry it with filter paper. 5.Immerse the electrode in PH 4.00 solution, -Press“CAL”button for 5 seconds,then press and release immediately second time -Reading will start flashing 4.00 -Wait until display stops flashing Rinse and dry the electrode with distilled water as before. 6.Place the meter back to the buffer solution to test calibration.If incorrect,please repeat the calibration