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Sailingdog - if you are going cruising and are going to spend a lot of time (years) on the boat I agree. For th average 3weeks a year trip and a few longish weekends, I wouldn't bother to spend the extra money. I have to run the compressor for the fridge anyway.
Netscheid - a simple multimeter ($10 - 60) and a hygrometer to measure the specific gravity of your battery acid (from an auto shop - mine cost about $10)
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