The Blaine air permeability apparatus measures the particle size of powders like Portland cement and limes by determining their specific surface area, expressed in cm²/g or m²/kg. It complies with EN 196-6 and ASTM C204 standards, offering greater accuracy and precision than manual methods. Calibration requires a standard reference material, such as NIST 114q, and tests should be conducted in a temperature-controlled environment for optimal results. It’s two type available, One type is Manual and One type is fully Automatic.