Contacting conductivity sensors are simple, rugged and inexpensive. Their major limitation is that they can only measure a small fraction of the entire conductivity range from ultra-pure water to wastewater.…

We humans like order. We like putting ideas into groups just as we like putting our socks in one drawer and shirts in another. We hate being confused and nothing…

The title of this blog looks like a self-inflicted wound. It suggests that I am ignorant about how one of the most basic tools in the water quality tool box…

When we humans look at objects we describe them in terms of color. We say that an apple is red or the sky is blue. To us color is an…