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 - Tractor Operator Safety - Loader & Backhoe Operation - by Staff. Loader Operation Do not transport anyone in the loader bucket. Always carry the loader bucket low for maximum stability and visibility, whether the bucket is loaded or empty. Always use the recommended amount of counterweihting to ensure good stability. Be careful when handling large objects such as round bales, logs,
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