I always wanted to walk into a cocktail party and nonchalantly toss off the phrase "I have a book deal" or "Excuse me. I have to take this call. It's my editor." I drive a Volkswagen so status symbols normally…

It's the most common, the oldest and the simplest measurement made in all of electrochemical measurements. And yet, I have found that almost no one understands how the humble pH probe works. I don't mean the measuring circuit that comes…