Quote Originally Posted by RattyMouse View Post
Why in the world do you need that extreme level of accuracy?
Because I'm creating new developers, and I need better accuracy than +/-0.1 pH to insure good consistency and repeatability.
When I mix developers, I am consistently within +/-0.02 pH. When the difference reaches 0.05 pH, I know something went wrong. But that requires a two-digit meter.

Mark Overton