Features: 1.6 in 1 Pool and Spa water quality test strips. 2.Tests for Free Chlorine, Bromine, PH, total Alkalinity, total Hardness and Cyanuric acid. 3.Test at both ends of pool twice a week for best results. 4.Easy to distinguish. Color difference is obvious, easier to compare the strip color to the color chart. 5.Dip in water for instant reading and comes in easy-to-store container. 6.Perfect for swimming pool and spa test. Descriptions: 1.This strip is a good way to easy understand your water quality in main six indicator(TC, CL, PH, ALK, CYA, TH). Specifications: Type: Swimming Pool SPA Test Strips Material: Paper Color: White Test: TC, CL, PH, ALK, CYA, TH Quantity: 50 pcs/bottle Test Range: Total Chlorine Test Range: 0-10ppm Free Chlorine Test Range: 0-10ppm PH Test Range: 6.8-8.4 Total Alkalinity Test Range: 0-240ppm Total Hardness Test Range: 0-1000 Cyanuric Acid Test Range: 0-240 Package Informations: Package Size: 100x40x40mm/3.9x1.56x1.56in Plastic Box Package Package Included: 1 x Swimming Pool SPA Test Strips(50pcs/bottle) Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.