I recently came across a Hydra static sensor for liquid level control. Quite interesting of a way to measure liquid levels. I see they are starting to be used in the food industry for several machines instead of float switches They work with a RTU resistance like a thermistor, but by the weight of the liquid volume vs. the atmospheric pressure. I just want everyone to be aware that if it is thru wall, no problem. But if it is suspended submersible by the cable, Do not crimp or over clamp the cable. The electric cable also has a small tube to sense atmospheric pressure. So one must be careful about the connecting cord.