pH 3-6 Narrow Range Acid Test Strips, 50/Pack

SKU: 33812-3060

$7.95USD or lower Each

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[5]   7 Reviews    | Write a Review

Indigo® pH 3-6 test strips indicate weak to medium acidity in liquids such as orange juice, milk or coffee. Use them to make sure your home made sushi rice, salsa or kefir acidic enough to prevent spoilage or pathogenic bacterial growth.


These strips are for use in determining a woman's vaginal pH balance & indicate the presence of yeast infections. Normal vaginal pH is in the 3.8-4.5 range, so above or below this can indicate a problem. If you get such readings, consult a physician before self treating.

Related information or images
Color chart intervals: 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0
  • Intervals of 0.5 pH unit but can resolve 0.25 with practice
  • Dip strip, shake off excess liquid, compare to color chart immediately
  • Minimum shelf life is 3 years if kept sealed but 5 years is typical
  • Store at room temperature away from sunlight.
  • The number of strips (50) per pack or vial is approximate.

Test Strip Documentation

Stability Statement Certificate of Analysis SDS
Indigo pH paper 3-6 acid 0.5 pH intervals Stability Statement Indigo pH paper 3-6 acid 0.5 pH intervals Certificate of Analysis Indigo pH paper 3-6 acid 0.5 pH intervals SDS
Reviews (7)

Great product. Shipped fast, and very affordable.

— Laura

As expected - and quick shipment.

— Amy

Great strips. Very easy to use and a great value. Fast shipping!

— Erin
Great value!!! Shipping is quick.
— Christine
Great test strips. Accurate and easy to use.
— Gail

Needed an easy way to check my materials for canning, especially my tomato sauces. These test strips saved me a lot of trouble since I didn't have to add any special acid to them after I discovered that mine were perfect at pH4.0. THis very simple test saved me a lot of money and i'm very happy with the product

— John
— Indigo:

Great news & an excellent example of how to use a test strip to make preparing tomato sauce & salsa easier. This old blog might be of some interest to others: How Does Litmus Paper Work? Not Like pH Strips?.

So prompt, so accurate. I only order from them. They are the best!
— Gail
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