Our Permanent Zinc Reference Electrodes (PZRE) are available with our moisture-wicking U.S. patented (US20210246561A1) and patent pending (CA3108476A1) engineered STABLE backfill that significantly improves accuracy, durability, and usability. Our PZRE is also available with our traditional legacy backfill mixture. The PZRE is ready to install off the shelf and does not require complicated mixing procedures in the field.