Also called medical equipment repairers, biomedical equipment technicians (BMETs) may repair anything from hospital beds and wheelchairs to blood-gas analyzers, spectrophotometers and electrocardiographic devices. They use specialized software, digital and electronic devices, hand tools and soldering irons. BMETs need to understand computerized, electronic, hydraulic and mechanical systems, any of which may be critical to the workings of a piece of equipment. They are often responsible for routine maintenance as well as repairs, and they must be able to guarantee the accuracy of equipment used to perform critical medical tests.