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I did use a smaller version (4 oz) of this in a student technology demonstrator of sorts. It had a glass tube coming out of one of the upper piece's ports. A fiber optic liquid level sensor was near the top of the tube.
You can see it here when I first started on it:
A container with water pump sits to the right.
And then here after adding lots of digital sensors of all types:
It was like a pinball machine, but with compressor, latching relays and pneumatic cylinders. The high school kids were interested.
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