Stanley 22846 IndXer 3-Way Test Kit with Case For maintaining proper water chemistry Analyzes three chemical factors: Chlorine, Bromine and pH Round, clear-view test block with matching color caps to 1/2oz. solutions of OTO and Phenol Red OTO tests for chlorine levels and Phenol Red tests for pH Phenol Red is for use with 2 or 3-Way Test Kits Only - not to be used with 5-Way Test Kits (Note: Phenol Red is not the same as Solution #2 Phenol Red - DO NOT interchange) Comes complete in polyethylene case For maintaining proper water chemistry Tests for Chlorine, Bromine and pH Comes complete with Polyethylene case, testing block and solutions Phenol Red and OTO Easy-to-read color readings