Ensure food safety in schools and daycares with Indigo® 400ppm quat test strips. Simple, fast sanitation compliance for cafeterias, prep areas, and kitchens..
Food safety is critical in schools and daycare centers, where children are especially vulnerable to foodborne illness. Quat test strips calibrated for 400ppm sanitizer strength make it easy for staff to verify compliance with state and local health regulations. By confirming that quaternary ammonium disinfectant solutions are within the correct range, these test strips help ensure cafeteria, prep, and serving areas remain safe and hygienic. Fast, accurate, and affordable, Indigo® 400 ppm quat (QAC) test strips are a trusted tool for kitchens serving large groups of children every day.
School and daycare kitchens face unique sanitation challenges due to high food turnover, young children’s susceptibility to illness, and frequent shared surfaces. Regular use of quaternary ammonium compounds (quats) helps control microbial growth, but verifying residual levels is critical. Using Indigo® 400 ppm residual QAC test strips ensures sanitizers are applied correctly and surfaces remain safe for students, staff, and visitors.
Proper quat application targets pathogens that are common in schools and daycare environments, including:
Regular residual testing helps ensure these pathogens are suppressed, reducing the risk of outbreaks and protecting children’s health.
Schools and daycare kitchens must meet local and national sanitation standards to maintain licensing and participate in federally regulated programs, such as:
Using residual quat test strips and documenting results provides verifiable compliance for inspections, supporting HACCP plans and FSMA requirements.
All Indigo® Quat (QAC) test strips come in 100 (not 50) strips per pack & 3 year minimum guaranteed shelf life backed by a Certificate of Analysis, Stability & SDS documents as listed below; Certificate of Conformance 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 Indigo® 3D Molecular Model Builder.
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® brand test strips are Made in USA & tested for accuracy using NIST compliant standards.
Great product and great customer service!
Consistent product, that is used repeatedly, Shipping times are as expected. Online ordering is easy.
Great customer service! Contacted me to let me know there was a less expensive shipping rate available. Very helpful.
Great product, much more affordable than competitor prices. Quick delivery.
They work wonderfully, was so happy to finally solve my sanitizer testing problems and to use hot water is great as well.
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.
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.
If you are using old strips, be careful as they may not be accurate. We in fact guarantee ours for 3 years minimum.Â
Test high-touch and food contact surfaces daily or after cleaning cycles. Adjust frequency based on inspection schedules, outbreak history, or specific facility protocols.
Common risks include Norovirus, Salmonella, Shigella, E. coli O157:H7, and Hepatitis A. Regular residual testing helps verify these pathogens are controlled.
Yes, Indigo® 400 ppm QAC test strips are compatible with stainless steel, cutting boards, countertops, tables, and other food prep surfaces.
Thanks for noting our prices. Our discounts start at just 2 it costs the same to as 1.