DPD Test Kits are test devices which operate with the help visual comparisons. The water that is to be measured is placed into the tester, rapidly dissolving (RAPID) tablets are added, and the water changes colour. The value is determined by comparing the coloured test water with the scale in the margin. The finer the scale, the easier it is to classify the test results.
Great for testing hot tub or swimming pool water.
Measures free Chlorine and PH level. FREE 10 Phenol Red Tablets and FREE 10 DPD No. 1 Tablets.