QAC QR Test Strips 0-400 ppm

SKU: 33819-400

$8.95USD or lower Each

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[4.9]   8 Reviews    | Write a Review

Buy Indigo® brand 0-400ppm quick response QAC test strips for only $8.95 per 100 strips. Buying just 3 packs of our 100 strips costs less than "free shipping" All Indigo® brand 0-400ppm quick response QAC test strips are backed by our 3 year minimum guaranteed shelf life & documentation including Certificate of Analysis, Stability & SDS. Certificate of Conformance available on request.

Be prepared for any health & safety audit or inspection. This test strip can measure the strength of many multi-quat formulations of single, dual and 4-chain quat disinfectants as listed in Quaternary Ammonium Compounds. You can even compare their chemical structures with the unique Indigo® 3D Molecular Model Builder.


Temperature and QAC strips reading relationship

Temperature vs ppm results for commercial formulations of quaternary amine sanitizers/disinfectants from 20 to 60oC (68-140F).
T (oC/oF) QAC strips readings at: 0; 50; 100; 200; 400 ppm
20/68  Readings ok for 0-400ppm
25/77  Readings ok for 0-400ppm
30/86  Readings ok for 0-400ppm
35/95  Readings ok for 0-400ppm
40/104  Readings ok for 0-400ppm
45/113   0, 50, 100 ppm readings ok;
  200 & 400 ppm read~ 1/2 color square higher
50/122  50, 100 ppm read~ 1/2 color square higher;
  200, 400 ppm read 1 color square higher
55/131  Readings 1 color square higher across whole range
60/140  Readings 1 color square higher across whole range

Dip strip for 1-2 seconds & get readings in 10 seconds at 0-100-200-400 ppm for quaternary ammonium disinfectant concentration. Read strip results immediately. If you wait the 30 seconds needed for some other strips you will get a reading that is too high.
  • Indigo® test strips have a guaranteed minimum 3 year shelf life but are stored in desiccant lined vials so actual shelf life can be 5+ years.
  • For technical explanation, read: Sanitizer Test Strip Expiration; Good Today, Dead Tomorrow?
  • These strips measure any quat formulation
  • Indigo® QAC test strips are calibrated for Oasis 146: see details. Consult your supplier if necessary.
  • The number of strips (100) per vial is approximate.

Test Strip Documentation

Stability Statement Certificate of Analysis SDS
Indigo Quat - QAC Test Strips 0-400ppm Stability Statement Indigo Quat - QAC Test Strips 0-400ppm Certificate of Analysis Indigo Quat - QAC Test Strips 0-400ppm SDS

Indigo® brand test strips are Made in USA & tested for accuracy using NIST compliant standards.

Reviews (8)

Consistent product, that is used repeatedly, Shipping times are as expected. Online ordering is easy.

— Mik

Great customer service! Contacted me to let me know there was a less expensive shipping rate available. Very helpful.

— Vanessa
Good quality product indeed !
— Sureemart

Great product, much more affordable than competitor prices. Quick delivery.

— Krystle
— Indigo:

Thanks for noting our prices. Our discounts start at just 2 it costs the same to as 1.


They work wonderfully, was so happy to finally solve my sanitizer testing problems and to use hot water is great as well.

— Cindy
— Indigo:

Thanks for letting us know your experience with hot water. The chemist who designed the strips even provided us with instructions on what to expect when using hot water with quats.


Great product as always and excellent service.

— john

Excellent product- temperature range is far more liberal and fits our needs. State surveyor recommended! Down side is cost may be a factor considering old strips are provided for free from our vendor.

— Brett Anderson
— Indigo:

If you are using old strips, be careful as they may not be accurate. We in fact guarantee ours for 3 years minimum. 

The order came very quickly and is producing the results we hoped for when ordering this product
— Rob
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