Phone: (519) 746-4761

Canadian Address:

169 Lexington Court, Unit I

Waterloo, ON, N2J 4R9


US Address:

Niagara Falls, NY 14305

Canadian/International ship from Waterloo; US orders from Buffalo, NY.

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Acid/Alkaline Strips 4.5-10 100/Pk

pH 4.5-10 test strips are ideal for accurate measurement of most foods & drinks as well as urine, saliva & water. Only $13.95/100 strips.

Minimum shelf life of 2 years if kept sealed even after opening. The 1 strip for all your health concerns.

SKU: 33811-4510
pH 4.5-10, Acid/Base, Triple Pad, ~100 Test Strips/pack

PRICE BREAKS - The more you buy, the more you save.
Quantity1+2+ 3+ 10+ 100+ 
Price for each$13.95USD$13.75USD$13.45USD$13.25USD$12.50USD
Your savings- 1.43%3.58%5.02%10.39%

Quantity :

Current Reviews: 3

The pH 4.5-10 test strips are an extended version of the 5.5-8 strips and come with triple pads for enhanced pH verification. They are also useful for science fair demonstrations where better precision rather than the full 1-14 range are needed. This can be very handy when testing different foods and drinks which occur mostly in this range.

While they cover a narrower range than the pH 1-14 strips the 3 test pads has the better 0.5 pH resolution; with practice, one can estimate 0.25 pH intervals. Typically only two of the three pads change colour at any given pH level which you match with the closest 3 on the color chart.

The pads on an unused strip are calibrated at ~pH5.75 with the yellow pad at the end of the strip matching the yellow under "pad 1" (bottom of the strip) on the color chart. Changes can be subtle & appear different under fluorescent, incandescent or sunlight. So, experiments done in the kitchen might appear a bit different when repeated in a school gymnasium.

Note: These strips come in a special dispenser pack with 100 strips. The number of strips per pack is approximate.

In addition to this narrow range acid-base test strip, there are also wide range acid-base pH test strips.

5 Stars 2017-06-01

-LEMIEUX, Geneviève
This PH scale is extraordinary. Very precise. Indigo's customer service is excellent. Very accommodating, attentive and prompt in their advice. Always a pleasure to order Indigo Instruments.

5 Stars 2017-08-10

-Efficiency and reliability at affordable costs
I discovered this company accidentally many years ago when I was seriously ill with no diagnosis. I used the pH strips to double check the medicinal test strips I had bought in order to diagnose myself. At first I bought only a bag of test strips; now they all come in a plastic box. The quality is very good; the tests are reliable; the strips last for over a year. The company ships immediately, and the product arrives to Norway in just a few days. I once sent an enquiry about the pH in drinking water (low due to acid rain), and I had an email discussion with a professional who works with the company. All in all, I consider Indigo a serious and professional website, and the pH tests of high quality.

5 Stars 2017-12-02

Better sensitivity (0.5 units) than typical pH paper. Provides accurate results without the need for electronic pH tools in difficult environments for electronics. And NO calibration needed.

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