Most batteries are sealed in a way that makes taking an electrolyte sample very difficult. So hydrometers have gone the way of the dinosaur. Not to mention that a larger portion of the population has gone to alternative form factors like AGM for example…
I also do not trust the “algorithms” in these newer tools to be 100% accurate. I bought one of the newer chargers that claimed to be omnipotent about battery condition and it was a royal piece of junk. I returned it and went back to my tried and true, non-digital version…