3/6/15pcs PH 4.01 6.86 9.18 Solution Calibration Buffer Powder Accuracy 0.01PH  For PH Tester Meter Digital Measurement

Specification:
Each Pack Volume: 250 ml
Each powder packet/sachet makes 250ml of solution (when mixed with distilled or deionized water)
Accuracy: ±0.01pH at 25°C
Quantity: 3/6/15pcs

Directions for use:
Step 1: Open the packet and pour the powder into a cleaning 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: Calibrate your pH meter. (Rinse the meter by pure water before test).