- Accuracy and stability: Our pH meter calibration powder is accurate within ±0.01 pH units at 25°C and remains stable over time. It is sealed in durable, moisture-resistant individual packaging to keep it fresh until use. - Easy to use: Mix the powder with 250 ml water, put the pH meter into the solution, stir gently, and wait a few seconds for the result. - Wide range of applications: Our pH meter buffer solution powder can test the pH balance in drinking water, aquariums, swimming pools, spas or hydroponics. - After-Sales Service: We provide high quality products and excellent service. If you have any questions, please contact us and we offer you a variety of solutions to choose from. - Use scenarios: - Calibrating pH meters for home aquarium maintenance. - Verifying pH in drinking water to ensure proper levels. - Maintaining pH balance in hydroponics, pools, or spas.