Stelth Model SRE-010-CPY
Copper-Copper Sulfate (Cu-CuSO₄)
permanent portable for water and/or soil in chloride free conditions

Stelth Model SRE-011-SPB
Silver-Silver Chloride (Ag-AgCl)
permanent portable for water and/or soil in chloride conditions

Stelth Model SRE-012-ZPR
Zinc-Zinc Sulfate (Zn-ZnSO₄)
permanent portable for water and/or soil in chloride free conditions