Cabin oxygen analyzer associated with manned spaceflight application (specific program undetermined), measuring 5″ x 5.75″ x 3.5″, marked on the side: "Spacecraft Cabin Analyzer, Part No. 510-0800-001, Serial Number 301, Mfr Part Number 147500, Contract Number NAS-9-8744, Beckman Inst-FSCM 05721." The front of the unit features an electrical connector, knob for selecting "800 Cabin," "300 Suit," or "800 Suit," and an oxygen indicator gauge. A blue property tag is attached. In fine condition, with the internal sensor element missing.