Customers from every water-testing sector have spoken, and Taylor has responded with an expansive selection of professionally manufactured specialty test kits for every job. With industry-leading innovation and quality built into every kit, there is never a need to own multiple test kits or reagents that you won’t use. You’ll never have to choose between accuracy and convenience—they’re always packaged together, in every water test kit. A Free Copper Thiocarbamate Color Card Comparator estimates the concentration of free copper ions in a water sample by comparing the color of a chemical reaction with the color standards printed on a card.