Water Leak Testing Papers

SKU: 33813-Co

$2.95USD or lower Each

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Indigo® cobalt chloride paper test strips detect water in tiny cracks & crevices from computer boards to walls; only $2.95 for one vial of 100 strips, save $$ on quantity.

You can use these larger 8x10" (200x250mm) cobalt chloride paper sheets for water vapor or cut then to the size you need. Extra large sheets up to 20x24" (500x600mm) can be ordered but there is a 100 sheet minimum.

See our blog Find Water Leaks Fast.


What is Cobalt Chloride Paper Used For?


Cobalt chloride test strips turn from blue to pinkish-white on contact with water. They are handy & practical for finding water in small cracks in circuit boards, ceramics and other recesses.

Keep them well stoppered in their vial since exposure to 55% relative humidity or greater is sufficient to cause a slow color change.

  • Number of paper strips (100) per vial is approximate.
  • Minimum shelf life of 3 years; much longer if kept stoppered.

Test Strip Documentation

Stability Statement Certificate of Analysis SDS
Indigo Cobalt Chloride Test Papers Stability Statement Indigo Cobalt Chloride Test Papers Certificate of Analysis SDS Sheet
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