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Battery monitoring has finally started to attract some attention, twenty years after the concept was originally introduced. It sure took a long time to convince all those guys that believed that a bulb hydrometer was all they needed to determine a Battery's state of health. Once a concept has been introduced and is proven popular, it does not take long for new products to follow. Today we are seeing an influx of monitors that range from a full function sophisticated computer driven monitor to devices that only monitor one single parameter. This leaves the user with the dilemma of choosing the right one from all those clever ads that proclaim the best product on the market.