0-34000 FT ELEVATION; 21% TO 4.4% OXYGEN; INTEGRATED PULSE OXIMETER WITH FINGER PROBE; INTEGRATED OXYGEN ANALYZER; EMERGENCY OXYGEN DUMP SWITCH FOR DELIVERY OF 100% OXYGEN; PORTABLE; GAS-BLENDING INSTRUMENT USED TO PRODUCE HYPOXIA WITHOUT CHANGES IN ATMOSPHERIC PRESSURE; USED FOR RESEARCH OR A TRAINING AID FOR SIMULATED ALTITUDE EXPOSURE