Indigo® triple-pad pH 1-14 test strips designed for acid and alkaline corrosion evaluation of zinc-coated (galvanized) steel. Ideal for metallurgical and industrial labs.
These pH 1-14 triple-pad test strips from Indigo® can be used for galvanized steel corrosion testing, where the protective zinc-oxide layer can fail under strongly acidic or alkaline immersion. By covering the full wide pH range and providing enhanced readability through a triple-pad design, these strips offer practicality for metal-coating labs, metallurgical QA teams, and educational settings. Whether you’re verifying immersion baths in sulfuric acid or sodium hydroxide or tracking coating degradation, these strips integrate seamlessly with your corrosion-resistance protocols.
Active use of test strips reinforces the practical link between pH and corrosion.
Run a class/demo where students simulate bath acidification and check with the strips.
Hands-on use → conceptual understanding → real-world application.
Best Practices for Use
These wide-range pH 1–14 test strips measure in 1 pH unit increments, making them ideal for testing solutions that span the full acidic-to-alkaline spectrum. For applications requiring greater precision, first use these strips to identify the approximate pH, then select one of our 0.5 pH increment acid or base test strips for more accurate measurements.
Practical Tips on Reading Test Strips
Lighting matters: colors may appear subtly different under fluorescent, incandescent, or natural sunlight, so try to use the same lighting each time.
Use these strips as a quick screening tool for industrial or educational applications, such as verifying acid or alkaline immersion solutions on galvanized steel, checking zinc oxide coating integrity, or teaching pH and corrosion concepts.
Educational or home experiments may produce slightly different results compared to lab settings, which is normal. Always wear protective goggles or glasses when handling acidic or alkaline solutions.
Related information or images
Acid/Base pH1-14 Test Strips 100/Pack
Specifications
The number of strips (100) per pack or vial is approximate.
Wide acid & alkaline range pH 7.0-14
Color chart shows steps of 1.0 pH unit;
with practice, one interpolate to a 0.5 pH unit
Minimum shelf life of 3 years if container kept closed but typically good for 5 years.
Color chart indicates in steps of 1 pH unit but 0.5 pH can be estimated.
Documentation
Test Strip Documentation
Stability Statement
Certificate of Analysis
SDS
Reviews (10)
2022-02-17
I received my order quickly. The three pad pH strips for ph 1-14 are very easy to read for my indigo vats...much easier than the standard pH strips. They were also less expensive than the same product from Maiwa.
— Jackie
2021-12-01
Works without issue and gives decent results. We have ordered a few times now and will likely continue.
— Nick
— Indigo:
Thank you for your test strip feedback.
2021-06-25
These came fairly quickly, and they work great :)
— Maria
2021-03-27
Great product and better price than where I previously purchased. Arrived quickly too! Will be reordering.
I prefer these pH test strips over others I have used. The delivery time was very fast. I am happy with the product and the service.
— Toby
2021-01-28
Excellent product. The strips are packaged well and easy to use. The triple pads make it quite easy to read very accurately. The order was very well packaged and delivered quickly.
— Doug D.
— Indigo:
Thanks for the feed back. We have had questions about reading triple pads, this explains further: How Do You Use a pH Test Strip?
2020-10-16
Nice product, the delivery was incredible fast. Thank you
— Sarai
2020-09-18
Great value!!! Shipping was quick.
— Christine
2019-12-10
I phoned in my order and it was promptly taken care of. Later in the day I picked up my order and that went smoothly as well. Very good service indeed and the products I order are always of good quality .
— Daniel
— Indigo: Thank you for your repeat business and kind words.
2017-08-08
Easy order online. Fast delivery right to the door! Recommend.
Thank you for your test strip feedback.