The SM-2003 single module calibration station for the GX-2003 portable gas monitors is a stand-alone station that can calibrate, bump test, charge, and archive data without the need of a computer to operate. The module has 4 operating modes, which include bump test only, % volume methane bump/calibration, calibration only, and bump with automatic calibration (if the bump test fails). The SM-2003 is capable of storing up to 200 bump test or calibration records. Each module has user adjustable test times and tolerances to meet specific testing requirements. The charger within the module quick-charges battery packs within 90 minutes and will recognize Alkaline batteries. The Calibration Station power requirements are 115/230 VAC, 50/60Hz.