Features: These testing strips provide a reliable, accurate reading in seconds so you can enjoy your next swim, stress-free. Strips are faster and simpler than liquid testing kits, with accuracy as good or better. Test for Total Chlorine ,Bromine, Free Chlorine, Total Alkalinity, pH, Total Hardness, and Cyanuric Acid. These seven tests provide extensive info for keeping your pool, spa or hot tub crystal clear. 2 types are optional, 50 strips or 100 strips, choosing based on your needs. Specifications: Material: Paper Size: approx 96x36mm/3.8x1.4in Type: 50/100 strips(optional) Package Includes: 50x Swimming Pool Test Kit or 100x Swimming Pool Test Kit note: Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item.