LevelGuard™ (RV & Marine Applications)SensaLevel Ultra™Tank Sensor
SensaLevel Ultra Tank Sensor provides accurate, early detection and warning about critical levels in water or wastewater holding tanks.* Incorporating patented Field-Effect sensing technology, owners benefit from solid-state reliability and simplicity.
* Not for use with metal holding tanks or in fuel / oil applications.
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I have not installed yet, but will comment after I have had opportunity to see level meter work.