Stelth Model SRE-007-CUY
Copper-Copper Sulfate (Cu-CuSO₄)
for buried or concrete service in chloride free environments

Stelth Model SRE-008-SUB
Silver-Silver Chloride (Ag-AgCI)
for buried or concrete service in chloride environments

Stelth Model SRE-009-ZUR
Zinc-Zinc Sulfate (Zn-ZnSO₄)
for buried or concrete service in chloride free environments