XB-4B Pocket DPD Residual Chlorine ColorimeterDetailed product description：

DPD Pocket Residual Chlorine Colorimeter

The DPD pocket residual chlorine colorimeter is used for simple and rapid measurement of residual chlorine in water. It is suitable for measuring residual chlorine in water plants, swimming pools, health and epidemic prevention departments and other units across the country, especially for on-site measurement without power supply. Its characteristic is the use of a covered colorimetric tube, which allows operators to avoid hand contact with the medication, with a measurement range of 0-2.5ppm. Usage: Rotate the upper cover of the colorimeter, place the disc color plate into the colorimeter, and then open the upper cover of the colorimetric tube. First, pour the water of the tested sample into 1/3 of the two colorimetric tubes. Then, place the DPD color chip into one of the colorimetric tubes, cover it with a plastic upper cover, and invert it back and forth. After the tablet dissolves, place it into the right colorimetric slot, and place the other colorimetric tube into the left colorimetric slot. Observe the visual hole with your eyes and rotate the disc to see that the colors of the left and right water tanks are similar. At this time, the number of the displayed hole is the value of residual chlorine.