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Mar 12 at 1:52 comment added hacktastical Your approach could use a 'tube within a tube' structure, with a clear tube inside a bigger PVC pipe, and open at the bottom.
Mar 12 at 1:04 comment added Pete W @hacktastical - yep. I think that's a brilliant solution. I see you already said what I wanted re: dip tube
Mar 12 at 0:37 comment added hacktastical The prism LED+phototransistors are available as T 1-3/4 size with a built-in prism. See here: abestmeter.com/electronic-water-level-switch
Mar 12 at 0:25 history edited Pete W CC BY-SA 4.0
added 38 characters in body
Mar 12 at 0:20 history edited Pete W CC BY-SA 4.0
added 38 characters in body
Mar 12 at 0:15 history answered Pete W CC BY-SA 4.0