Obviously a hydrometer can only be used with a servicable battery, not one that you can't remove the caps or have access to the cells, aren't most of the common auto batteries like that today, sealed ?
I have an older, from the 60's, or early 70's meter with the load switch on it, it has the element inside that heats up and vents the heat through the perforated cover. Is that what you refer to as carbon pile load tester, same thing HF sells for around $20 ?
I've always had good luck with these, though you can't pinpoint a cell being bad, you certainly can tell when a battery is compromised.
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Today's Featured Article - The David Brown Rose Badge - by Samuel Kennedy. In the 13th century civil war was raging in England. Two English noblemen were involved in a conflict which became known as the War of the Roses. The Duke of York had as his emblem a white rose and the Earl of Lancaster had a red rose. Today the white rose is the official emblem of the county of Yorkshire and the red rose has been adopted by the neighboring county of Lancashire.
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