I'm not aware of anything you can buy,
QuoteI'm not aware of anything you can buy,Try:-http://uk.farnell.com/capacitive
I think the hardest part will be keeping the middle rod in the middle of the tube, as I can't use a washer or anything in the middle of the tube (it would stop the water running up the tube). I'm thinking that it'll be held at the top by a rubber grommet with small holes drilled in it, effectively slowing the filling and emptying of the sensor smoothing out the readings slightly.
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