"Chlorine Comparators, DPD Method" is a simple method to test for the presence of residual chlorine. When DPD reagents are added to water containing residual chlorine, they display specific reactions and exhibit pale red to purple colors based on the level of concentration. You need to add reagents only once. (For total residual chlorine measurement, add potassium iodide (optional) as well, requiring two operations in total.) It can distinguish the presence of both free residual chlorine and total residual chlorine. [Features] • Color sample plate removal type • Easy maintenance → Removable color sample plate allows easy cleaning of dirt or condensation • Economical → When the colors on sample plates deteriorate, just the plates themselves can be replaced * For more details, please contact us or download our catalogs.