The level measuring instruments are suitable to measure the level of gas or fluid and it could be done directly or indirectly which would be done according to the application. A level measuring instrument would act as an indicator that shows the level of the liquid and this information would be carried in the form of AC signals and this is done for the control purpose. The level switches would monitor if the liquid is at a high level or low level according to the set point.

Class of instruments designed to sense, display, and transmit signals that correspond to the level of the material that is being measured within a containing vessel.