You can easily check the residual chlorine concentration.
● After submerging in the sample, it can be measured by checking the discolor in between 15 and 30 seconds.
Measurement range/scale (ppm): 0-25-50-100-200-300
Quantity: 1 piece (100 sheets)
Measurement time: 15 - 30 seconds
Color samples are displayed on the container itself.