Originally called the acidimeter, the pH meter is an important device for measuring the pH of a solution.

It will be noticed that he did not use either the acidimeter or sour whey, but he lifted the make out of the old ruts of mere practical chance and introduced to it the more definite methods of science.

Originally called the acidimeter, the pH meter is an important device for measuring the pH of a solution.

It will be noticed that he did not use either the acidimeter or sour whey, but he lifted the make out of the old ruts of mere practical chance and introduced to it the more definite methods of science.