Manipulator (noun)

1. A person who controls or influences others for their own gain.
2. A device or machine that is used to control or move something.
3. A person who is skilled at using their hands to work with small objects or tools.

Origin:

From manipulate + -or.

Examples:

1. He is a manipulator who uses others for his own gain.
2. The manipulator on the robotic arm is used to move and position the end effector.
3. The manipulator is used to control the movement of the spacecraft.
4. She is a skilled manipulator of small electronic components.
5. The manipulator on the assembly line is used to pick and place electronic components.