Abstract: Key wards Disinfectant Test paper In order to simplify the Method of titration of disinfectent concentration 2 disinfectant concentration testpaper Type D-1 was developed. It can be used for measuring the concentration of the active ingvedient of disinfectants such as chovine-cantaining disinfectants. The results obtained in measurement of sodium dichlovoisocyanurate calcium hypochlorite, Sodium hypochlorite and chlorinated Trisodium phosphate were similar to those obtained by iodometry the test paper is stable on storage and convenient for use and can measure disinfectant 20—2000 mg/L as Cl₂ Concentrations.