Halma Plc engages in the development, production and sale of hazard and life protection products. Its four specialist business sectors are: Process Safety, Infrastructure Safety, Medical and Environmental & Analysis. The Process Safety sector contains products which protect assets and people at work, including instruments which detect flammable and hazardous gases and explosion protection devices. The Infrastructure Safety sector contains products which detect hazards to protect assets and people in public spaces and commercial buildings, including fire and smoke detectors, security sensors and audible/visual warning devices and sensors used on automatic doors and elevators in buildings and transportation. The Medical sector contains products used to improve personal and public health, including devices used to assess eye health, assist with eye surgery and primary care applications. It also includes fluidic components such as pumps, probes, valves and connectors used by medical diagnostic OEMs. The Environmental & Analysis sector contains products and technologies for analysis in safety, life sciences and environmental markets, including opto-electronic technology and gas conditioning products. These products also monitor water networks, including UV technology for disinfecting water and water quality testing products. Halma was founded in 1894 and is headquartered in Amersham, the United Kingdom.