Features: Each swimming pool test strip provides accurate and fast results. Pool water test strips, Instant reliable results with simple and clear instructions. Tests for 7 parameters: total hardness, total chlorine, bromine, free chlorine, pH, cyanuric acid (stabilizer) & total alkalinity. You can use the swimming pool test paper to test the water quality of your family swimming pool or outdoor swimming pools. With 50 pieces in each bottle; The sufficient quantity is enough for your daily use and replacement, you can also share them with your friends and family members. Specifications: Material: Paper Size: approx 9.3x3.5cm/3.7x1.4in Package Includes: 50 Pieces Pool Test Strips 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.