Used to calibrate pH meters and ensure accurate pH measurements in laboratories and industrial processes. Provides a stable and known pH value against which instruments can be adjusted. Commonly used in quality control, environmental testing, pharmaceutical production, food and beverage analysis, and research settings where precise pH control is critical. Available in various pH levels (e.g., pH 4.0, 7.0, 10.0) to cover the typical measurement range. Helps maintain consistency, traceability, and compliance with regulatory standards.