PH Calibration powder (set of 2)

Please follow the guidelines in your PH meter user manual when calibrating the instrument.

-If you use the PH meter daily we recommend a calibrating the instrument monthly.

-If the PH meter is not used actively (once a week) we recommend calibrating it every 2-3 months before use.

-If you have not used your PH meter in the last 2 months or longer we recommend calibrating the instrument before use.