The RE-5 AF Field Kit is designed for use with the RE-5 Reference Electrode and includes essential components such as a 4 Oz. Bottle of Copper Sulfate Anti-freeze Solution and a 6 Oz. Bottle of Copper Sulfate Crystals. This kit is part of a comprehensive set that includes the flat surface plug assembly and is supplied with the necessary instructions for proper use and maintenance. The kit is intended for corrosion engineers and professionals who require accurate and reliable reference measurements for their corrosion testing and analysis.