CERTIKIN TKPT25P - Pooltest 25 Professional Photometer 0-5.0ppm Chlorine (free and total); 0-10ppm Bromine 0-100ppm PHMB; 6.8-8.4pH; 0-500ppm Alkalinity; 0-200ppm Cyanuric acid; 0-500ppm Calcium Hardness; 0-1.0 Iron; 0-5.0oom Copper (free and total); 0-10,000ppm Salt; 0-2.0ppm Ozone; 0-200ppm Sulphate; 0-500ppm Chloride; 0-500ppm Total Hardness; 0-0.5ppm Aluminium; 0-100ppm Nitrate; 0-1.0ppm Ammonium; 0-4.0ppm Phosphate; 0-0.3ppm Maganese; 0-250ppm Chlorine HR; 0-100ppm Hydrogen Peroxide HR.