Conveniently and accurately validate almost any commercially available air sampling pump for proper air flow function before its deployment. The Gilibrator-2 Air Flow Calibration System consists of an easy-to-operate microprocessor-controlled base, a twist-on standard flow wet cell for air flow ranges of 20 cubic centimeters (cc) to 6 liters per minute (LPM), a DC charger/AC power supply, tubing and soap solution with dispenser in a hard shell carrying case.