The primary instruments on Spirit and Opportunity include a stereoscopic Panoramic Camera for studying the local and distant terrain; a miniature thermal emission spectrometer (Mini-TES) for identifying rocks and soils and for looking skyward to measure the Martian atmosphere; a Moessbauer Spectrometer for close-up mineralogical studies of iron-bearing rocks and soil; an alpha-particle X-ray spectrometer to measure the chemical composition of rocks and soil; magnets for collecting dust particles; and a Microscopic Imager for obtaining close-up, super-high resolution pictures of Martian rocks and soil.