The K-1579 is the only single-analyte kit in Taylors product line designed for measuring the high chlorine concentrations found in sodium hypochlorite bleach solutions. Two of our color-matching tests that utilize orthotolidine will go as high as 250 par. Test kits are easy to use and generally more accurate than test strips. They measure the levels of various chemicals to help keep your pool clean and clear. Use the kit as directed for best results.