AWOL:
.Not sure if its true, that's why I was looking for the water proof sensors, but unfortunately those are not available here.
what about automotive sensors?
From one of my sensorics classes:
Automotive sensors (older versions, and maybe even some new ones), are essentially created from the floating part and the resistor wire...
The floating part is sliding on the resistor wire, giving us the exact volume of the liquid inside the tank (like a pot meter)...
Older car models had a 12V system, so if you hit something, and +12 and GND shorted, well the car would blew up...
My teacher had the opportunity to open one of cars tank, and he found out that the wires, and the connectors of the sensor were so badly insulated, and that every petrol car is essentially a time bomb (imagine riding over bumpy roads)...
So if your liquid won't blow up, you could use the existing car sensors.