Nynelly 15 Pcs PH Calibration Buffer Solution Powder Set?for Precise and Easy PH Calibration?PH Calibration Powder Solution 6.86,4.00,9.18

Specifications: 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: 6 Pcs/1 Set Directions for use: Step 1: Open the packet 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) Note: 1. Transition: 1cm=10mm=0.39inch 2.Please allow 1-3mm error due to manual measurement. pls make sure you do not mind before you bid. 3. Due to the difference between different monitors, the picture may not reflect the actual color of the item. 4.Container should be glass or ceramic, don‘t use metal material. CAUTION: Not a drinkable solution! Keep away from Children. In case of skin contact, rinse with water.