How to Calibrate the pH Meter
Take ph 6.86 standard solution as an example Power on→Press the MODE/CAL button → Adjust to pH mode→Put the electrode into pH6.86 standard solution, then wait for the readings to stabilize(usually 5~10 Seconds) → Press and hold the MODE/CAL button and release after 6 seconds→until the readings of pH6.86 is no longer flashing, and the calibration of pH6.86 is completed. Rinse the electrode with distilled water and blot dry. Repeat the above steps if you need to calibrate other solutions.
How to make a standard solution:
Completely empty the powder into a clean 250ml glass beaker
Add 250ml of PH Buffer Powder to the beaker
Stir until the powder has completely dissolved