Universal pH Water Indicator Test Paper

SKU: 33813-U8

$2.55USD or lower Each

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Quantity1+10+ 100+ 
Price for each$2.55USD$2.30USD$2.05USD
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[5]   3 Reviews    | Write a Review

Universal pH paper reacts quickly to produce a permanent record of water leakage even where different pH levels may occur; only $2.55 per 8x10" (200x250mm) sheet; save with quantity discounts.

  • 8x10" (200x250mm) sheets
  • Reacts instantly with liquid water 
  • Indicates the presence of water & its pH
  • Shelf life 3 years if kept sealed; 5 years is typical.
  • Watch our video Water Leak Problems?
  • Certificates of Analysis, Stability & SDS on-line; see Specifications
  • Price breaks on volume; immediate delivery

What is Universal Indicator Made of?

The native color of the sheets is orangish-yellow but changes at different pH levels due to the various indicators. This makes it useful as both a pH indicator & water leak detector.

The universal pH water indicator paper sheets shown in the image are 8x10" (200x250mm) but is available in large format 24x20" (600x500mm), mininum order is 100 sheets. Other custom sizes available; MOQ applies.

In Kits
33813-WS8Water Leak Sheet Sample Pack 8x10", 3 pk1
  • Sheet dimension is 200x250mm or 8x10"; custom sizes available
  • Reacts with water of any pH & will indicate acid or base
  • Reaction is irreversible

Test Paper Documentation

Stability Statement Certificate of Analysis SDS
Indigo Water Detection-pH Sensitive Test Paper 200x250mm Stability Statement Indigo Water Detection-pH Sensitive Test Paper 200x250mm Certificate of Analysis SDS Sheet
Reviews (3)

We needed some bigger sheets of ph paper for our second grader's science fair project (write on ph paper with clear crayon or wax sticks, spray with acid water to turn red, reveal SECRET MESSAGE! ), and this was one of the few places I could find anything other than tiny test strips. Shipping was quick, and although this science fair is costing an arm and a leg, the price for the ph paper seems reasonable in light of the size of the sheets. I came back today to order more (he used more working out the pre-fair kinks than expected), so fingers crossed that it gets here in time. If not, we'll manage. I wouldn't hesitate to shop here again, and am glad to be able to support a business that isn't Amazon.

— Valerie

I can't say how well these work for my application, I haven't used them yet, but the shipping was much faster than I expected. I've ordered these for use in identifying water ingress into my car, and they seem to be perfectly suited for the job.


Very useful for detecting the origin of leaks near a faulty toilet in my home. would buy again.

— David
— Indigo:

Glad it worked. For those who want to know a little bit more about the different leak detection sheets, check out: Find Water Leaks Fast: Cars, Boats, Roofs, Plumbing


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