3.This paper introduces a new method to raise the measuring precision of the pH meter which also is applicable to the DCV source with high resistance like the pH meter in theory.
4.The total particulate matter (TPM) on Cambridge pad was extracted with CO-2 free water and the pH value of aqueous extraction was measured by pH meter.
5.? A pen-like pH meter with pH probe and micro-power integrated circuitry is developed in this paper. The pH meter has more features as powered by a cell, displaying with LCD, automatic temkperature compensation, dual-point adjustment, easy-operated and so on, but has high accuracy of ±0. 01pH.
