Halma Plc is a holding company which engages in the development, production and sale of hazard and life protection products. It operates through the following segments: Process Safety, Infrastructure Safety, Medical, and Environmental and Analysis. The Process Safety segment offers products to protect people and assets at work such as interlocks that control critical processes safely; instruments that detect flammable and hazardous gases; explosion protection and pressure relief systems, and corrosion monitoring products. The Infrastructure Safety segment offers life protection in infrastructure and for safe movement such as fire detection systems, smoke detectors, fire suppression, people and vehicle flow solutions, security solutions, and elevator safety products. The Medical segment specializes in devices that assess eye health, assist with eye surgery and primary care applications, critical fluidic components used by medical diagnostic original equipment manufacturers, and laboratories; sensor technologies used in hospitals to track assets and support patient and staff safety. The Environmental and Analysis segment relates to products and technologies for analysis in environmental safety and life sciences markets such as opto-electronic technology and sensors. The company was founded in 1894 and is headquartered in Amersham, the United Kingdom.