Cremer’s electrode
The kit that brought pH measurement into reality
The process of learning about the world involves building simple mental pictures we can use to gain knowledge. Yet deepening our understanding invariably involves having to unlearn some ideas so deeply embedded as to become almost intuitive. At the very least, we are forced to let go of some of those certainties as we start to appreciate the complexity of our world. The story of the glass electrode is a curious tale of learning and unlearning.