The Colorimeter SC400 is a rugged, waterproof, single parameter colorimeter for laboratory and field testing. The SC400 is available in four parameters: Chlorine (free and total), Chlorine Dioxide, Ammonia and Fluoride. This portable instrument uses the popular Powder Pack reagent chemistries and can be taken wherever residual values are monitored. The Colorimeter features a large backlit display, a real-time clock, datalogging features and a user calibration mode which allows the user to calibrate against prepared standards.