A robotic manipulator arm pours water from one clear plastic drinking glass into another on a stand to demonstrate dexterity.
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Mastering the Manipulator Arm
It takes great skill to operate a manipulator arm on a remotely operated vehicle (ROV). With the ROVs on deck, pilots can hone their skills with everyday objects like glasses as shown here during the 2021 North Atlantic Stepping Stones expedition. 
Credit

Art Howard, GFOE/NOAA Ocean Exploration, 2021 North Atlantic Stepping Stones: New England and Corner Rise Seamounts.