A composite miniature pH electrode was made of pencil core of 0.3 mm diameter modified with electrolytically polymerized polyaniline. It was combined with the Ag/AgCl electrode as reference.

• 在 0.；3 mm直径的铅笔芯上电修饰聚苯胺，封入玻璃毛细管中，并与Ag/AgCl电极组合成复合微型pH电极。