ISI is a UK R&D company that designs and develops remote sensing instrumentation for use in hostile and high-temperature environments. ISI's core business is providing innovative solutions typically requiring laser-based remote sensing instrumentation in difficult environments targeted at the specific problem. ISI provides an end-to-end solution for designing instruments, from an initial simulated concept through to benchtop instrument development and then to the manufacture of a complete, working instrument. On-site, ISI has a range of optical, mechanical, and electrical design tools including CAD and ray tracing facilities. In addition, the company has a fully equipped optical lab and dark room for testing new instrumentation.