Air permeability tester for the automatic determination of the specific surface (grinding fineness / Blaine value) of powdered materials, especially for the permanent control of manufacturing characteristics in the daily laboratory work.   Key benefits for the user: ✓ 5.7" color display with touchscreen operation for intuitive and user-friendly operation ✓ Alternating operation with two measuring cells enables a higher test frequency ✓ Implication of the environmental temperature into the calculation of the specific surface ✓ Height adjustable optical sensors for the adaption of the cycle time to different types of material ✓ Calibration using reference materials feasible by the user ✓ Density, initial weight and porosity are freely selectable ✓ Integrated compartment for the storage of consumables and reference materials ✓ Any number of correction factors (K-factors) storable ✓ Runtime indication resolution: 0.1 seconds ✓ Calculation of the specific surface based on any number of single measurements on one powder bed ✓ Integrated data base for the storage of up to 300 test results including all test parameters ✓ Integrated data base for the storage of materials with different density and porosity ✓ Possibility to connect a printer for automatic raw data print out ✓ USB interface for easy and fast export of test results including all test parameters ✓ Possibility to connect a dial gauge for the automated compensation of compaction deviations ✓ Improved comparability of the test results by separately calibratable measuring cells (compensation of minimum volume differences of the measuring cells) ✓ Ability to change the correction factor subsequently for an extended result evaluation