18 Pack- pH Meter Buffer Solution Powder 6.86/4.00/9.18 pH Calibration Solution

Ensuring Accuracy. pH buffer solution powder. Accuracy: ±0.01pH at 77°F(25°C). Item Form Powder. Individually wrapped to maintain freshness until use. Made with qualify materia. Step 2:Add 250mL deionized water (or distilled water) to the beaker.