SenSafe Free Chlorine Water Check 50 Strips NEW Tests free chlorine from 0.0 to 6.0 ppm Part number 481026 The only USEPA approved test strip. US Patented (6541269 & 5491094) Perfect for filed/on-site drinking water compliance monitoring with no instrument required. Measure cloudy water samples with negligible effect on results. No indicator bleach out. No monochloramine interferences. Condition: New
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