Stelth Model SRE-037-CSY
Copper-Copper Sulfate (Cu-CuSO₄)
for “Deep-Water” applications in fresh chloride free environments (crush-proof and weighted)

Stelth Model SRE-038-SSB
Silver-Silver Chloride (Ag-AgCl)
for “Deep-Sea” applications in chloride environments (crush-proof and weighted)

Stelth Model SRE-039-ZSR
Zinc-Zinc Sulfate (Zn-ZnSO₄)
for “Deep-Water” applications in fresh chloride free environments (crush-proof and weighted)