The part of a sentence "a convenient device" is correct and usable in written English.
You can use it to refer to any piece of equipment, piece of technology, or tool that can make life easier or more efficient. For example: "This new phone is a convenient device; it fits in your pocket and has powerful computing capabilities."
"The pipeline is a convenient device for fighting a larger battle," Mr. Yergin said.
By the climax you feel LaBute is simply using 9/11 as a convenient device to dignify an end-of-the-affair play.
It is a convenient device which helps to visualise how colours relate to each other and what, in theory, happens when they are mixed.
This review is currently a convenient device for politicians such as George Osborne to dodge questions about how much money they'll allocate to the defence budget overall.
Her madness, at times, seems a convenient device to bring the story to a conclusion while still following the fairy-tale motif -- as does the happily-ever-after ending.
Contrary to current fashion, science can tell us little about how to raise our children or how to deal with their adolescent difficulties, though it often serves as a convenient device for legitimising prevailing prejudices.
Delivering insulin to mimic normal physiology through a more convenient device may help reduce HbA1c levels to within recommended ranges.
And because of the iPad mini's key areas of difference compared to the iPad (over 50percentt lighter, 23percentthinnerer), it's a much more convenient device to pick up and put down frequently while watching TV programming.
It has shown in [48 53] that the Wiener-Hopf equations provide us a simple, elegant and convenient device for developing some efficient numerical methods for solving variational inequalities and complementarity problems.
The two main criticisms of using microwaves go like this: that the convenient device a) produces radiation in your food and outside of the appliance, thereby upping your cancer risk, and/or b) zaps all the nutrients out of your food.
To me, the article looked like The Times had allowed itself to be used in an attempt to rehabilitate Greenspan's reputation through the convenient device of a letter whose writer was not available for questioning.
