This is an enlarged image the Indigo® test strip color chart that comes with our high level, 0-1500ppm quaternary ammonium chloride (QAC) test strips.
All Indigo® Quat (QAC) test strips have a 3 year minimum guaranteed shelf life & come with a Certificate of Analysis, Stability & SDS documents listed below; Certificate of Conformance on request. Be prepared for any health & safety audit or inspection.