A sight glass or water gauge is a type of level sensor, a transparent tube through which the operator of a tank or boiler can observe the level of liquid contained within. == Liquid in tanks == Simple sight glasses may be just a plastic or glass tube connected to the bottom of the tank at one end and the top of the tank at the other.
A sight glass or water gauge is a type of level sensor, a transparent tube through which the operator of a tank or boiler can observe the level of liquid contained within. == Liquid in tanks == Simple sight glasses may be just a plastic or glass tube connected to the bottom of the tank at one end and the top of the tank at the other.
Source: Wikipedia "Sight glass" · CC BY-SA 4.0
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