Any Questions? Call Us 310-822-1000


BORIN® STELTH® 2 Solid-State Reference Electrodes for Buried and Concrete Service

  • Palladium
  • Copper
  • Silver
  • Zinc

PALLADIUM: Until now, hydrocarbons proved deadly to all available reference electrode chemistries, including industry staples copper, silver, and zinc.
The applications for the new STELTH HCP are limitless.

Problem zones which have stunted use of traditional chemistries is another place the STELTH HCP will succeed – such as areas that have too many parts per million of chlorides for silver reference electrodes.

READ MORE: Introducing STELTH HCP™: New Palladium-based Reference Electrodes are Hydrocarbon-Proof (HCP™ )

COPPER: For chloride free environments.

SILVER: For environments with chloride.

ZINC: For chloride free environments. 

The STELTH® 2 is our most versatile reference electrode, as it works well in most environments – from moist to dry, and from soil to concrete.

The STELTH 2 features our proprietary ceramic made with our Moisture Retention Membrane (MRM™), which lets moisture in, traps it within the ceramic, and keeps the cell’s internal electrolytes from leeching or drying out in desert soil.

The 32 in2 of ceramic sensing surface area also gives the STELTH 2 the versatility to work with the desert’s common soil condition variations, ranging from hydrated to dehydrated. (If the soil gets dehydrated, there is no electrical path to take a reading, but once the moisture comes back, the reference electrode will reactivate and be ready to take readings.)

This large sensing area of the STELTH 2 also makes your job easier by making electrode positioning less critical, as you can achieve accurate readings from a wider variety of placements. (Whenever possible, it is optimal to install a stationary electrode at the spring line of the structure to eliminate IR-drop and achieve a more accurate reading.)

Also see: STELTH® 6:  A smaller version of the 2″ thick STELTH 2; at only 3/4″ wide, the STELTH 6 needs a much smaller hole drilled for installation, making it ideal for concrete applications.

Just a few reasons BORIN® STELTH® solid-state reference electrodes are unique:

  • Never need recharging or recalibrating
  • Impregnated with membrane that keeps electrolytes from drying out or getting contaminated
  • Trap hydrogen sulfide or excess chloride ions before they cause damage
  • Let you know when you have dangerous levels of AC to deal with
  • Can thrive in ALL environments, even those chemically detrimental to other reference electrodes
  • Remain accurate for their lifetime
  • Won’t die every winter

BORIN stands behind every STELTH reference electrode you buy:

  • We test EVERY SINGLE reference electrode we make
  • You can track/trace any STELTH
  • Every STELTH is calibrated for the life of the cell
  • Our STELTH reference electrodes will work for years and remain stable after you retire

Buried and Concrete Applications


1.5″ (38.1 mm) width x 7.5″ (178 mm) length

Standard Lead wire

20′ (15 m) of #14 (2.5 mm2) RHH-RHW wire (any length of wire available)


Ceramic with Moisture Retention Membrane (MRM™)

Service Life

Minimum 30-year service life

Shelf Life

Infinite shelf life, infinite stability

Color Code

Palladium-Palladium Chloride / Pd-PdCl2 : orange
Copper-Copper Sulfate / Cu-CuSO4 : yellow
Silver-Silver Chloride / Ag-AgCl : blue
Zinc-Zinc Sulfate / Zn-ZnSO4 : red

Certified Potential Range
pH Range

4–9 pH

Working Temperature Range

32°F to +176°F (0°C to 80°C)

Material Temperature Range

-60°F to +185°F (-51°C to 85°C)

Catalog Sheet: STELTH 2 Reference Electrodes

STELTH® 2 – Hydrocarbon-Proof (Pd-PdCl2)

Model SRE-041-HCP

For direct burial and concrete in any chloride level environment.

STELTH® 2 – Copper-Copper Sulfate (Cu-CuSO4)

Model SRE-007-CUY

For direct burial and concrete in low chloride environments (can tolerate chloride plus bromide levels up to 1,000 ppm).

STELTH® 2 – Silver-Silver Chloride (Ag-AgCl)

Model SRE-008-SUB

For direct burial and concrete in seawater/chloride environments (with chloride plus bromide levels in excess of 1,000 ppm but less than 19,000 ppm).

STELTH® 2 – Zinc-Zinc Sulfate (Zn-ZnSO4)

Model SRE-009-ZUR

For direct burial and concrete in low chloride environments (can tolerate chloride plus bromide levels up to 1,000 ppm).

BORIN® STELTH® 2 Solid-State Reference Electrode
for Buried or Concrete Applications
Dimensions of product:  1.5″ (38.1 mm) width x 7″ (178 mm) length BORIN Manufacturing
Standard lead wire: 20′ (15 m) of #14 (2.5 mm2) RHH-RHW wire (any length of wire available) Address: 5741 Buckingham Pkwy. Unit B,
Culver City, CA 90230
Weight of STELTH 2
(no wire):
0.95 lbs. Phone: (310)-822-1000
Weight of wire: 10′ wire = 0.20 lbs. Email:
Weight of product in case: STELTH 2 + 20′ of wire x 12 = 22 lbs. per case
STELTH 2 + 50′ of wire x 12 = 30 lbs. per case
Standard shipping time: 24 hours (or less) from order placement
Dimensions, case of 12: 17.5″ x 14.5″ x 13.5″ Minimum order: 1 case of 12