Level Measurement (Capacitive Principle)
Linear scale is fitted on tank for visual reference. Here an Acrylic Tank is made / provided as a Main Tank whose Water Level is to be measured. So when the Tank is empty these two Metal Plates along with inside Air, forms a Capacitor. But while forming this Tank two of its walls, which are face to face, are provided with Metal Plates inside. 
Specifications:-
• Least Count: - 1 mm
• Digit: - 3 ½
• Powder coated enclosure.
Acrylic Tank
• Max reading height: - 100 mm.