This series of steam sterilizable and autoclavable pH electrodes has been designed to retro-fit the Broadley James Corp. FERMPROBE® ELECTRODE HOLDER. These electrodes have beeen engineered as improved replacements using the same configuration as the original equipment. These electrodes were designed with a unique solid polymer reference electrolyte and annular ceramic nonfouling reference junction which incorporates a double junction reference cell. These electrodes are special because they can withstand many repeated sterilization cycles with minimal effect to teh response or stability. The electrodes are also designed to be reliable and extremely cost efficient.