Long ago the health community and the authorities made it sure that no factory uses the suspended chain for measuring liquids in their tanks. The suspended chain is the oldest method known to mankind ever since the factories started using tanks bigger than the human size. Suspended by a pulley on top of the tank, the chain was made lengthy enough to touch the base of the tank as it was lowered. Special markings were made on it to note the level of the liquid. As the chain touched base of the tank, it was pulled up again and the level was noted. The length of the chain that got wet by the liquid was perceived as the liquid level inside the tank.

Although this method was the cheapest and a reliable way to note the levels, it posed a great threat to the safety of the humans performing it. The chain would also contaminate the liquid inside the tank because whenever it was to be lowered down, the top had to be opened and the liquid was exposed to the air. In case of sensitive chemicals, many people have either been harmed beyond repair or have even died during the practice. This is the main reason why the health authorities have made sure that this practice does not go on in the modern age. In replacement to this method and many other methods where humans were risked, the low cost ultrasonic liquid level measurement devices are now available in the market from where they can be bought and used for the purpose.

The industries have experienced a great revolution in the past decade as many new laws and many new machines have been introduced. These machines have not only helped to ease the burdening processes in the factories, but they have also helped to smoothen the tasks so that better quality can be insured during the manufacturing in the factories. As times have progressed and many changes have been witnessed, the devices being used a decade ago are now either so upgraded that they look like something new or the old ones have been replaced completely by new devices. Even the ultrasonic liquid level measurement devices have now been upgraded and they now not only serve a single purpose, but they are now able to multi task and provide pin point accuracy even in the worst conditions.