Hach 652013 AquaChek Hi-Range Free Chlorine Test Strips
The Hi-Range Free Chlorine strips provide measurements up to 600 ppm. Use the high range free chlorine test to confirm chlorine levels for surface disinfection and to determine when extremely high chlorine is present. Reads free chlorine up to 600 ppm. Test results in seconds with just one dip!Features. Allows you to test high-range chlorine. Dip and check levels. Dimension - 2 x 2 x 3.75 in.