Metir plc manufactures and sells equipment used monitoring water for toxins and pathogens in the United Kingdom, the United States, Europe, China, and internationally. The company provides MiD platform solutions for MS detection, including 4500 MiD; MiDas, a compact sampling interface that allows automated sampling, dilution, and injection for direct MS analysis; and MiD Protein ID, a miniaturised mass spectrometer, as well as consumables and spare parts. It also offers SPE-LC-MS that extracts and analyze low concentration samples; and Microtox reagent consumables that is used for monitoring water for toxins and pathogens. In addition, the company provides product support services and consultancy services, as well as laboratory, engineering, and monitoring services to various industries, including environment, biopharma, pharmaceutical, personal care, food and drink, and academia. It sells its products through OEMs and distribution sales channels. The company was formerly known as Microsaic Systems plc and changed its name to Metir plc in February 2025. Metir plc was incorporated in 1998 and is based in York, the United Kingdom.