Specification: Phenol Roure/Red: Indicator solution for Hydrogen Test PH Volume: 20mL Orthotolidine OTO: Indicator solution for Chlorine Test CL Volume: 20mL Water Quality Test Kit. For Chlorine Test CL and Hydrogen Test PH. With a plastic box, easy to storage. Convenient and practical, easy to carry. Chlorine Test CL Information: 1.Compare your reading with the scale values. 2.The scale values represented by a number indicate the quantity of chlorine combined with water. 3.For effective treatment, the reading should be between 1.0 and 1.5 best Information: 1. Rinse the test vial and fill to the mark with water sample. 2. Add 4 drops of OTOOrthotolidine solution. 3. Place cap on vial and shake to mix. 4. Compare your reading with the scale values. Hydrogen Test PH Information: 1.Compare your reading with the scale values. 2.The scale values represented by a number indicate the PH condition or alkaliinity of the water. 3.For comfortable water and a saving of chemical products, the reading should be between 7.2 and 7.6 best Analysis: 1. Rinse the test vial and fill to the mark with water sample. 2. Add 4 drops of red phenol solution. 3. Place cap on vial and shake to mix. 4. Compare your reading with the scale values. Package List: 1 set x Water Quality Test Kit