双高阻输入电位测量装置问世以来,已有十多年的历史了。1970年Brand等人设计了能对两个高内阻离子选择电极之间的电位进行直接差分测量的实验装置。1971年Bleak等人介绍了一种新的流程pH分析器。后来相继出现了一些双高阻输入电位计或pX计(包括pH计在内),例如pW 9445型pH-mV计、pW 9416型选择性离子分析器和Orion 901型离子分析器等。近几年来,我国也有一些单位 Double high resistance input potential measurement device has come out, more than 10 years of history. In 1970, Brand et al. Designed an experimental setup capable of directly measuring the difference in potential between two high internal resistance ion selective electrodes. In 1971 Bleak et al. Introduced a new process pH analyzer. Later, there have been some double high resistance input potentiometer or pX meter (including the pH meter included), such as pW 9445 pH-mV meter, pW 9416 selective ion analyzer and Orion 901 ion analyzer. In recent years, China also has some units