Final answer:
The mercury sphygmomanometer is being phased out due to environmental and health concerns. Digital and aneroid sphygmomanometers are common alternatives.
Step-by-step explanation:
Among the types of sphygmomanometers, which are devices used to measure blood pressure, the mercury sphygmomanometer is being phased out. Mercury sphygmomanometers are known for their accuracy but are being replaced due to concerns about mercury's environmental and health effects. Alternative options for measuring blood pressure include digital and aneroid sphygmomanometers. Electronic and digital devices are much more commonly used now due to their ease of use and safety compared to mercury devices.