Fisher Labs Water Level Indicators. Fisher Labs water level indicators are devices used to measure water depth in wells and tanks by using an electrode assembly that signals when it contacts the water surface, which is indicated by an LED and an audio alert. They feature a two-conductor cable with numbered depth markers, a brass electrode, and a spool for easy deployment and retrieval. These are available in various lengths, such as 100, 300, or 500 feet, and some metric versions are also offered.
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