For those that are interested, the electronics goldmine Proteus flow switch I got works like a charm. It does not restrict flow with 1/2 tubing and its internal volume is not so great that I see pressure drop as a huge concern. The only bad news is that it will not work when supplied with 12 volts. I got around that by using the - 12v line from my power supply as a ground and tapping a + 12 v line as the "hot" lead. Doing that got it to work. Obviously, my judgement in my earlier post that it would work on 12v was wrong.
Still a helluva a deal at 9.95!
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The technology is within the reach of even the smallest nuclear power.
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