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MacNivel Battery Powered Water Level Monitor – the simple way to monitor water levels (and other liquids) in your tank. The MacNivel is a simple device that indicates the level of water (and other suitable liquids) contained in a storage tank. It’s compact size, economical price and battery power, make the MacNivel an extremely versatile option for many installations. Ideal for use in camper vans, caravans, mobile Water Bowsers, to name just a few. How the battery powered water leve …