JEOL_LogoJEOL is a world leader in electron optical equipment and instrumentation for high-end scientific and industrial research and development. Core product groups include electron microscopes (SEMs and TEMs), instruments for the semiconductor industry (electron beam lithography and a series of defect review and inspection tools), and analytical instruments including mass spectrometers, NMRs and ESRs. JEOL is headquartered in Tokyo, Japan, with 25 subsidiaries and two associated companies.