Although there is only one word difference, it is definitely different. The acid concentration meter measures a relatively high concentration (expressed in percentage concentration) acid, such as 5% sulfuric acid or 10% hydrochloric acid. The concentration of such high-concentration acids (or strong bases or salts) cannot be measured with ordinary conductivity electrodes. A special electromagnetic concentration meter must be used for automatic and continuous measurement. The earliest patented inventor of the electromagnetic concentration meter (1985, the first year of the implementation of China's patent law) and the most widely used acid, alkali and salt concentration meters at present is in Dalian Kelida Instrument Research Institute.
An acidometer is also called a pH meter. Anyone who has studied chemistry knows that the pH value is the negative logarithm of the hydrogen ion concentration. It cannot replace the acid concentration meter. How many hydrogen ions does a drop of concentrated sulfuric acid contain? ! The pH glass electrode will soon be damaged and invalidated in concentrated acid or alkali. Never measure concentrated acid or alkali!