Instruments with electromagnetic nozzle

[Tavrida]

I recently saw an technical instrument that uses electromagnetic field to capture and move small objects. For example it can be used to capture and unscrew nut(female screw). How this instrument can be named right to find its description in the Internet?

 

[Baluncore]

A female threaded fastener is called a nut.
http://en.wikipedia.org/wiki/Nut_(hardware)

A nut can be fastened or removed with a;
Spanner or wrench. http://en.wikipedia.org/wiki/Wrench
Socket. http://en.wikipedia.org/wiki/Socket_wrench
Nut driver or nut spinner. http://en.wikipedia.org/wiki/Nut_driver
Nut runner. https://www.google.com.au/search?biw=1211&bih=751&tbm=isch&sa=1&q=nut+runner&oq=nut+runner

Where did you see the tool or instrument ?
Did the device have a socket to fit the nut being removed ?