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Digital technology is used to record anomalies in weak electric fields caused by water and other liquids. The sensing cell itself is fully encapsulated and does not come into contact with the liquid, does not corrode and remains completely insensitive to oil and other dirt. The level switch has no moving parts. Can also be used for fresh water. Contains no toxic mercury. Designed for pumps that draw a maximum of 20A at 12 or 24 V.