Chlorine analysis has wide commercial applicability, and is useful for testing drinking water, pool and spa water, aquarium water, industrial and environmental water, and for other types of water testing. The eXact® Micro 7+ Advanced Photometric System (US Patent #7333194), which uses DPD for touch-free chlorine analysis in a test strip form, was granted U.S. Patent #7491546 on February 18, 2009. The U.S. Patent Office recognized this system as new, inventive, and useful in the water testing industry.
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