The Automated Gas Permeameter is designed to measure the permeability of core specimens 1.5" in diameter and up to 4" in length. The core specimen is placed into a quick access core holder with a stationary core boot. Confining pressure constrains the core inside the boot while gas flows through it. Dual auto-switching mass flowmeters measure the flowrate of the gas through the core. The software controls the confining pressure and inlet pressure on the core while calculating the permeability.