Halma plc is a United Kingdom-based holding company. The Company is engaged in developing products for hazard detection, life protection, personal and public health improvement, and environmental protection. It operates through four segments: Process Safety, Infrastructure Safety, Medical and Environmental and Analysis. The process safety segment offers specialized interlocks, instruments which detect flammable and hazardous gases, and explosion protection and corrosion monitoring products. Infrastructure safety products segment’s products include fire and smoke detectors, fire detection systems, security sensors and audible/visual warning devices, safety sensors used on automatic doors and elevators. The medical segment offers ophthalmic devices, blood pressure monitoring and fluidic components. The environmental and analysis segment provides products to monitor flow, pressure, leakage and quality in water networks, including opto-electronic technology and gas conditioning products.