Everyone would agree to the fact that to learn about the level of liquid inside a container, it is best to open the lid and take a look inside. We have a variety of jars, bottles and cans in our houses in which we keep an assortment of liquids. Whenever we need to learn about the liquid level in it, all we do is open the lid and take a look inside.

The human being is never satisfied without learning for sure about anything he inquires. And the best judge in the case of liquid measurements is our eyesight. But what would one do to measure the level of a container that is larger than a human being. Or what about a container that has no lid at all and is made of an alloy that does not allow the eyesight to look beyond its outer wall? Nevertheless, we need a liquid level indicator in this case to learn about the level of liquids inside such extraordinary containers.

These containers are unlikely to be found in the local store around the block. These containers and tanks are used in factories and power generation plants where highly toxic chemicals and liquids are used. The specially designed containers are made single skinned too ensure that no leakage occurs in it. Another reason for not installing a lid on it is that these chemicals need to be as far from the human reach as possible. And when there is no lid on the container, it also provides security against contamination so the liquids remain in the purest form possible.

We have seen a couple of single skinned containers in our daily lives. The commonest is the fire extinguisher. The chemical inside it is not fit for humans and it used to clear away fire, this is the reason it is made a single skinned container. If there were an opening available in it, miscreants would easily tamper with it and in case of emergency the fire extinguisher would be empty or the chemical inside would not be usable.

For a precise measurement in factories, they use the ultrasonic level indicator. The readings available on the display of this gadget inform the user about the level of liquid, powder or gas inside the container. The ultrasonic waves created by the gadget’s transducer are the real source of measuring through walls. It allows the gadget to read through the walls of containers made of alloy and plastic.