本标准描述了测量Cu/CuSO4 PREs在特定环境应力下的特定物理性能和相对稳定性的试验方法。这些参比电极虽然在物理意义上是“永久性的”（通常不会移除），但其使用寿命有限。本试验方法旨在提供预期相对耐久性的测量值。本标准由工作组256维护。

This standard describes a test method to measure specific physical properties and the relative stability of Cu/CuSO4 PREs when they are subjected to specific environmental stresses. These reference electrodes, while "permanent" in the physical sense (they are not commonly removed), do exhibit a finite service life. This test method is intended to provide a measure of the relative durability that may be expected. This standard is maintained by Task Group 256.