Professional 3-way water test kit for maintaining proper Chlorine, Bromine and pH chemical levels in swimming pools and spas Kit includes a 1/2 ounce dropper bottle of OTO (Orthotolidine) Chlorine Test Solution and a 1/2 ounce dropper bottle of Phenol Red pH Test Solution Includes clear view water testing block with accurate measuring scale and integrated color markings for the chemical levels Comes with a user guide and it all stores in a polyethylene case Easy to use, just fill each test tube with pool water, add 5 drops of the proper solution into each test tube, put the test tube caps on, shake the testing block then check the Chloride, Bromine and pH readings