Depth Sensor Proposal - Experimental Results
By the tube, I assume you mean the manometer. The most accurate way to accomplish this would be to make a scale that is calibrated to your setup and then use that to measure the indicated water depth. This could consist of a paper scale glued to a ruler or a similar configuration. The reason you would want to use a separate scale is that the manometer reading is the distance between surfaces. If evaporation of water in the column occurs then a fixed scale would not be able to accurately measure this distance.
Of course, the more expensive and easier route would be to use a cheap single board computer with a differential pressure sensor to provide the data.
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