Transparent Level Indicator
The Liquid enters the chamber on either side of which are a pair of heavy duty glasses, which permits observations of level, colour and clarity of the Liquid.

Reflex Level Indicator
As the liquid fills in the tank, the liquid level can be seen in the Reflex Type Level Gauge. Since the inner surface of the glass has Reflecting Prisms, the Liquid Levels shows black in contrast to mirror like surface above.