Fix grammaticality in this sentence: One invented device uses optical sensors to supervise how these elderly pick things up and how they use them.
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The device is a device that is used to monitor the position of the object being observed.
Correct: The device is a device that is used to monitor the position of the object being observed.
Correct: The device is a device that is used to monitor the position of the object being observed.
Correct: The device is a device that is used to monitor the position of the object being observed.
Correct: The device is a device that is used to monitor the position of the object being