This is a Taylor Drop Test Hydrogen Peroxide .5 ppm (Iodometric) Test Kit (1 drop equals .5 ppm or 1%). The K-1443 Kit tests for Hydrogen Peroxide (undiluted strength) using a drop test system and iodometric method/chemistry.
Some swimming pools do not use chlorine but a combination of ultraviolet disinfection with hydrogen peroxide. So testing for hydrogen peroxide would be an important test for individuals using this method for sanitizing their pools or spas.