Level Switch
A level switch measures the level of fluid from bottom to top of the tank.
This instrument is usually used to control level in tanks which work with simple mechanical mechanisms.
Their main applications are to determine the amount of fluids and to adjust and control the output according to the set point.
In choosing a level switch, these matters should be taken into consideration: 
- Tank’s housing material
- Whether the tank is closed or open to the Atmosphere
- The amount of fluid’s pressure
- Whether fluid is an acid or not
- If the fluid is an acid, the type of corrosion
This company offer level switch with American brand “Kleev” and Indian brand “General Instrument Consortium”.