The Mars Observer instrument complement meets the scientific objectives derived from the National Academy of Sciences Space Science Board's Committee on Planetary and Lunar Exploration report, "Strategy for Exploration of the inner Planets." Specifically, the complement includes the gamma-ray spectrometer, magnetometer/ electron reflectometer, Mars balloon relay, Mars Observer camera, Mars Observer laser altimeter, pressure modulator infrared radiometer, thermal emission spectrometer, and ultrastable oscillator.