Quote Originally Posted by ardhuru View Post
Some years ago, I had come across a page that advertised a plastic coated tape one could buy in any length; when immersed vertically, the pressure applied on the tape would change its resistance, depending on how much of it was submerged.

Unfortunately, I hadnt saved the URL, and cant seem to locate it now, however much I googled.
You can "roll your own" 2 wires, some conductive foam, some heat shrink tubing, seal the end which is immersed . . . HOW DEEP is the water ?