There are plenty of sophisticated and expensive lab robots around these days. These liquid-handling LEGO robot are much cheaper to make and can still be used for science and chemistry experiments. They work with standard lab plasticware. The most basic version can be built using a LEGO Education EV3 core set.
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Liquid-handling Lego robots 1: Hands-on learning of modern biotechnology concepts
As you can see in this video, the robot offers manual control. It uses a block type programming interface. More info is available here.
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