I’m working on building a system to measure the water level in my rain water tanks. Finally today I’ve managed to get my hardware all working, and now I need to build the physical measurement device. Originally I was going to use ultra-sound to measure the depth of the water but I decided that was a bit too fiddly. Then I considered using some sort of pressure sensor, but they are a bit on the expensive side. Finally I came up with the idea of using a variable resistor attached to an arm with a float on the end. This seems like the easiest and above all the cheapest way to get what I want 
It should be interesting to see how it all comes together
pressure sensors are great for remote pressure measurements and they very accurate too”~~
pressure sensors that are designed for weighing scales are sometimes expensive:~*