18 Pack pH Buffer Solution Powder for Precise pH of pH Meter pH Calibration Solution Powder Packets pH 6.86/4.01/9.18

Specifications: Accuracy: ±0.01pH at 77°F(25°C) ? 6 packets of pH 4.01 Solution powder ? 6 packets of pH 6.86 Solution powder ? 6 packets of pH 9.18 Solution powder Directions for use: Step 1:Completely empty the powder into a dry glass container. Step 2:Add 250mL deionized water (or distilled water) to the beaker. Step 3:Stir until the powder has completely dissolved. Step 4:Put the pH meter in the solution and gently stir and wait a few seconds for the result. CAUTION: Not a drinkable solution!