Hi,

I am facing a problem recently and hope to find a solution to it
ASAP.

I have a big tank which can hold about 2 tonnes of water (meant for
drinking. The tank is below ground level and no one has access to
below ground level. The traditional method of measuring the water
level is to put a dip stick into the tank. However if the dip stick is
dirty, it will pollute the water. I am thinking if there is a type of
sensor which can meaure the water level without having the sensor
touching the water. Hope to hear from you soon. Rgds.