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BOJACK 15 Pack of pH Meter Buffer Solution Powder for Precise and Easy PH Calibration, PH Calibration Powder Solution 4.01pH,6.86pH and 9.18pH June2023_cocoonwix Mobile phone ball head canBOJACK 15 Pack of pH Meter Buffer Solution Powder for Precise and Easy PH Calibration, PH Calibration Powder Solution 4. 01pH,6. 86pH and 9. 18pH Steps for usage Step 1: Open the package and pour the powder completely into a clean, dry glass container. Step 2: Add 250 ml of deionized water (or distilled water) to the container. (Preferably 250 ml calibration flask) Step 3: Stir until the powder is completely dissolved. Step 4: Calibrate your pH meter,