Scuba II test kits use the standard photometer test tablets and not the scuba testing tablets. Test / Range Alkalinity Total M 0-300 mg/l Cyanuric Acid 1-160 mg/l pH Value 6.5-8.4 Chlorine 0.1-6 mg/l Bromine 0.2-13.5mg/l Contents: Scuba II in robust box Reagent tablets 20 each DPD No.1 & Phenol Red Photometer 10 each DPD No.3, CyA-Test & Alkalinity-M Photometer 2 Batteries (AAA) Stirring rod Instructions Every pool owner should check the most important parameters in his pool at regular intervals.