CALIBRATION SOLUTION BUFFER PH 4.00 100ML - SOLAX

Taking your probe is putting it in the pH4 solution. If the value is not correct, a calibration must be carried out.

After calibration, if the measurement is still not good then the probe must be replaced.

It is recommended that you calibrate your probe as close to the setpoint as possible. Example: for a pH 7.5 set point, preferably calibrate with a pH7 and pH9 solution if your regulator allows free choice of calibration points.