Vattenpassanordning och förfarande för dess framställning

摘要

A liquid level device comprises a longitudinal support member (10) with a least one elongate duct (11) closed from all sides and filled with a coloured liquid (11a) to such degree that in the horizontal position of the duct both the volume of liquid, and the volume of air above the liquid occupy the duct along its entire length. In a preferred embodiment, the support member (10) is made of flexible material so that it also may be wound around a pole-shaped object (12b) such as a lamp post or telegraph pole to determine its vertical position as seen from any direction.