Water Leak Testing Papers
Cobalt chloride paper test strips can detect water in hard to reach places like cracks & crevices in circuit boards; only $1.95 for one, 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.
You can also see our blog about leak detection.
Note: The number of strips per pack or vial is approximate.
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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.