U.S. Pool Supply Standard 3-Way Swimming Pool & Spa Test Kit, Tests Water for pH, Chlorine and Bromine Description Features: 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 Product Details: Is Discontinued By Manufacturer ‏ : ‎ No Package Dimensions ‏ : ‎ 5.51 x 4.29 x 1.54 inches; 4.96 Ounces Item model number ‏ : ‎ TK-100 Date First Available ‏ : ‎ June 13, 2017 Manufacturer ‏ : ‎ U.S. Pool Supply Best Sellers Rank: #13,665 in Patio, Lawn & Garden (See Top 100 in Patio, Lawn & Garden) #27 in Swimming Pool Water Test Kits #27 in Swimming Pool Water Test Kits Customer Reviews: 4.3 4.3 out of 5 stars 3,326 ratings