The phrase "special devices" is grammatically correct and commonly used in written English.
It refers to specific tools or equipment that are not commonly used or that serve a specific purpose. One example of using this phrase in a sentence could be: "Our company has invested in special devices to improve the efficiency of our manufacturing process."
Clubs and persons have special devices printed on them.
The ophthalmologist physically examines the eyes with special devices and does various tests to determine visual function.
The service has also drawn interest from blind users, who use special devices that read them their e-mail.
Pigeons, for example, can learn to discriminate differences in colours that are indistinguishable to human beings without the use of special devices.
To find them, Elissa Resources employees mapped the landscape and used special devices to figure out where radiation was unusually high.
These special devices separate solid from liquid waste and allow collection of both to be used, ultimately, as fertilizer for the soils.
General blood flow throughout the body is provided by the four- or five-chambered heart, but circulation in legs and wings requires special devices (e.g., the pulsating membranes located within the base of each tibia and sometimes in the tarsus).
In low fields, such as the Earth's magnetic field, the NMR signal is expected to be weak because the nuclear magnetization is small, but special devices can enhance the signal 100 or 1,000 times.
Large-scale figures often reveal special devices that were invented to overcome technical deficiencies; some are crudely assembled from parts; many maintain a simple overall shape with details merely incised; feet might be represented by pegs inserted into bored holes.
BEIJING — When Hu Jintao, China's top leader, picked up the telephone last August to talk to a senior anticorruption official visiting Chongqing, special devices detected that he was being wiretapped — by local officials in that southwestern metropolis.
But when researchers at the Northwestern University Feinberg School of Medicine used special devices to track the activity levels of more than 1,000 people with knee osteoarthritis, they were surprised to find that many were in fact couch potatoes.
