Good morning neighbor George, My short answer is because it ONLY measures the SPECIFIC GRAVITY of one cell alone. I cant explain all the physics and chemistry to you in a paragraph and besides chemistry was my worst subject lol maybe you can research and study up on the chemistry and physics of lead acid batteries its NOT my favorite subject grrrrrrrrrrrrrr. I am hanging onto my 40+ years of checking batteries with THREE not just one instrument (but others can do as they please fine by me) Hydrometer, Volt Meter and Load tester even if I cant fully explain all the chemistry and physics to lay persons as I'm very much a lay person myself when it comes to electrochemical energy storage, so sorry, I JUST CANT ANSWER YOUR QUESTION maybe some chemical engineers can help us????
Keep warm neighbor, sorry I cant explain it to you.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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