The SPM Instrument MG4-2 is a high-performance, multi-gas monitor designed to detect and measure the concentration of up to four gases simultaneously. It is ideal for use in a variety of applications, including industrial hygiene, environmental monitoring, and safety. The MG4-2 is equipped with a large, easy-to-read display and a user-friendly interface. It also features a built-in data logger and a variety of alarm options.