Calibrating a meter:
1. Immerse the electrode in the phosphate solution supplied with pH 7 at a temperature of 25║C and shake it gently. Allow the reading to stabilize. To calibrate it, turn the calibration screw until the reading corresponds to the value of the supplied solution.
2. Immerse the electrode in the calibration solution marked with pH 4 and follow the same procedure established and above until the meter indicates the correct measurement.
-Ph 7 calibrating liquid for pH meters
-Calibration solution