pH Test Strips Litmus Papers

Choose from 10 different Indigo® pH & litmus strips, papers & sheets for all your acid & alkaline testing requirements at home or in the lab. Full documentation provided including a Stability Statement, Certificate of Analysis & SDS available on-line. Optional next day delivery in any quantity of most items.

Buy Indigo® test strips, the brand you can trust for accuracy & technical support. Call us on our toll free line for immediate assistance or e-mail us with your questions. 1 hour response is typical during business hours, M-F, slightly longer on weekends.

Indigo® pH & Litmus Test Strips

pH, the amount of acid or base in (mostly) aqueous solutions, is important in areas as diverse as health, food & water testing, electroplating and more. Choose the specific strip you need for the accuracy & range you are investigating.

Displaying 1 to 13 (of 13 products)
Acid/Base pH 4.5-10 Test Strips, 100/Pack

Acid/Base pH 4.5-10 Test Strips, 100/Pack

SKU: 33811-4510
$13.75USD or lower Each
Acid pH 0-7 Test Strips 100/Pack

Acid pH 0-7 Test Strips 100/Pack

SKU: 33811-0070
$13.75USD or lower Each
Base pH 7-14 Test Strips, 100/Pack

Base pH 7-14 Test Strips, 100/Pack

SKU: 33811-0714
$11.50USD or lower Each
Acid/Base pH1-14 Test Strips 100/Pack

Acid/Base pH1-14 Test Strips 100/Pack

SKU: 33811-0114
$13.75USD or lower Each
Acid pH 0-2.5 Test Strips, 50/Pack

Acid pH 0-2.5 Test Strips, 50/Pack

SKU: 33812-0025
$7.95USD or lower Each
Sushi/Salsa pH 3-6 Test Strips, 50/Pack

Sushi/Salsa pH 3-6 Test Strips, 50/Pack

SKU: 33812-3060
$7.95USD or lower Each
Acid pH 4-7 Test Strips, 50/Pack

Acid pH 4-7 Test Strips, 50/Pack

SKU: 33812-4070
$7.95USD or lower Each
Base pH 10-13 Test Strips, 50/Pack

Base pH 10-13 Test Strips, 50/Pack

SKU: 33812-1013
$7.95USD or lower Each
Universal pH 8x10" Paper

Universal pH 8x10" Paper

SKU: 33813-U8
$2.95USD or lower Each
100 Blue Litmus Papers

100 Blue Litmus Papers

SKU: 33810-BV
$2.95USD or lower Each
100 Red Litmus Paper Strips

100 Red Litmus Paper Strips

SKU: 33810-RV
$2.95USD or lower Each
Red Litmus 8x10:200x250mm

Red Litmus 8x10:200x250mm

SKU: 33810-R8
$1.50USD or lower Each
Blue Litmus 8x10:200x250mm

Blue Litmus 8x10:200x250mm

SKU: 33810-B8
$1.50USD or lower Each
More Information

pH of Common Household Items - Indigo Instruments

Acid Strength and Concentration
Click on Image for Larger Version

Technical

The method you choose for measuring pH pH measurements depends is largely determined by the accuracy you need. The choices below go from least to most.

  • Litmus test papers give qualitative results; i.e. yes or no, acid or alkaline.
  • pH test strips are semi-quantitative. i.e. they tell you how much but with some uncertainty.
  • A pH meter is quantitative with some error.
  • Titration is quantitative and most accurate but is time consuming & can be expensive if done in a certified lab.

 

Instructions/Safety

There are no specific hazards associated with the pH test strips or litmus papers themselves. However, caution is advised with handling the acidic and alkaline chemicals themselves. Extreme caution is advised in handling strong acids & bases. Gloves and especially goggles are recommended. Chemically resistant aprons should be worn for very strong acids (pH 0,1) & very strong bases (pH 13,14).

Frequently Asked Questions

FAQ for pH-Litmus

We offer 8x10" (200x250mm) sheets of red litmus paper & blue litmus paper. Simply cut them to whatever size you need for your application.

Red litmus paper is basically filter paper that has been treated with chemical indicators extracted from lichens. It will turn blue when dipped in alkaline (basic) aqueous solutions. We offer both uncut 8x10" (200x250mm) sheets of red litmus paper or bottles of smaller red litmus strips.

Blue litmus paper is basically filter paper that has been treated with chemical indicators extracted from lichens. It will turn red when dipped in acidic aqueous solutions. We offer both uncut 8x10" (200x250mm) sheets of blue litmus paper or bottles of smaller blue litmus strips.

  • Our pH test strips resolve acidity or alkalinity in steps of 0.5 or 1.0 pH unit.
  • For strips with step of 1.0 pH , the accuracy is +/- 0.4-0.5 pH unit.
  • For strips with step of 0.5 pH, the accuracy is +/- 0.2-0.25 pH unit.