Features: High-precision: Accuracy pH calibration solution powder is produced with premium quality material under rigid conditions and sealed by durable moisture-proof individual packets so please rest assured it. Easy to use: PH buffer powder is save time and money.Only need open the packet then mix the power with distilled water and wait a few seconds for the result. Widely Used: PH meter buffer solution powders is suitable for testing pH balance of drinking water pool aquarium etc. It also can help you to test the pH of your beer or wine with your calibrated pH meter. Lightweight and Portable: Individual sized packets suitable for travel and long time storage.Kindly note:It can be work for any electronic pH Meter. After-Service: Any problem with our product please contact us first and we will reply you with the best solution within 24 hours. So why not have a try? Specifications: Product name: PH Powder Calibration Solution Volume Per Pack: 250 ml Each powder/sachet makes a 250ml solution (when mixed with distilled or deionized water) Accuracy: 0.01PH at 25C Operation: Step 1: Open the package and pour the powder into a clean dry glass container. Step 2: Add 250mL of deionized water (or distilled water) to the beaker. Step 3: Stir until powder is completely dissolved. Step 4: Calibrate pH meter. (Clean the meter with purified water before test) Notes: Due to manual measurement please allow 1-3mm error. Please make sure you don't mind before you bid. The picture may not reflect the actual color of the project due to the differences between different displays. Not a drinkable solution! Keep away from children. In case of skin contact rinse with clean water. includes: 1*PH Buffer Powder "