THE ULTIMATE AT HOME POOL TEST STRIPS for your swimming pool and spa. Tests for 7 parameters: total hardness, total chlorine, bromine, free chlorine, pH, cyanuric acid (stabilizer) and total alkalinity EXTREMELY EASY TO USE pool water test strips, Instant reliable results with simple and clear instructions. Simply dip and compare with large color chart on bottle. Ideal range marked on bottle BONUS FREE MOBILE APP INCLUDED - Record, track and monitor your pool test strip results with ultimate accuracy. Available for IOS and Android 100 STRIPS MEANS 100 TESTS - Each swimming pool test strip provides accurate and fast results for any water sources including fresh and salt water pools, spas and hot-tubs GET SAFE, CLEAN AND CRYSTAL CLEAR WATER, our pool and spa test strips come with a great e-book explaining what your results mean and how you can keep your water in a healthy and clean condition year round 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.