GB/T 26811-2011 "Ion selective electrode" standard defines the type, technical requirements, test methods and inspection rules of Ion selective electrode, which is applicable to five general Ion selective electrodes such as potassium, sodium, fluorine, chlorine and ammonia. The standard specifies the electrode classification, working conditions, Appearance requirements and adaptability of transportation and storage to ensure that the electrode can work normally under various environment conditions. The standard also specifies the test conditions and equipment requirements to ensure the stable performance and Measurement accuracy of the electrode. This standard provides detailed guidance for the production, use and inspection of Ion selective electrodes.