Professional Hydrion Chlorine Test Strips CH-1000, Range 0-1000 100 strips: Amazon.com: Industrial & Scientific
FMP Chlorine Test Strips, 100 per Vial | Tri-State Restaurant Supply, Inc.
Restaurant Sanitizer Test Kit for Quaternary Ammonium (QAC, Multi Quat) 0-500 ppm & Chlorine 10-200 ppm Test Paper [2 Vials of 100 Paper Strips] - Walmart.com
FMP 142-1363 Quaternary Ammonia Sanitizer Test Strip Tape - 100/Bag