Features: 3 in 1 Pool and Spa water quality test strips. Easy to test: Free Chlorine/Bromine ,pH,Total Alkalinity. Easy to distinguish: Color difference is obvious, easier to compare the strip color to the color chart. Test at both ends of pool twice a week for best results. Dip in water for instant reading and comes in easy-to-store container. Perfect for swimming pool and spa test. Item type: Swimming Pool SPA Test Strips Material: Paper Color: As pictures Quantity: 50pcs/bottle Test Range: Free Chlorine Test Range: 0~10ppm pH Test Range: 6.8~8.4 Total Alkalinity Test Range: 0~240ppm Package includes: 1 bottle of Pool SPA Test Strips(50pcs) Notes: 1. Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you 2. Please allow 1-3cm measuring deviation due to manual measurement