Description: Material:Paper Model:2 in 1/3 in 1/4 in 1/5 in 1/6 in 1 Quantity:50 Strips/Bottle 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 Cyan-uric Acid Test Range:0~240 Package included: 50pcs Set Swimming Pool Test Strips Note: 1.1 inch=2.54cm 2.Please allow 1-3 cm error due to manual measurement. pls make sure you do not mind before you bid. 3.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Designed?for?testing?Free Chlorine, Total Chlorine, pH, Total Alkalinity, Total Hardness and Cyanuric acid Portable and convenient, easy to use High precision and easy operation Water testing for swimming pools or spa pools Can test effective chlorine, pH, total hardness