[50x POOL TEST STRIPS] 6-in-1 in a Tube for Pool & Spa. Professional Pool and Spa Test Strips - This 6-in-1 test strip kit is specially designed for swimming pools, hot tubs, and spas. It delivers fast and reliable results to check your water quality. It can detect total hardness, free chlorine, total chlorine, cyanuric acid, total alkalinity, and pH in your pool all at once. [Highest Quality Standard] BMUT Quality: Check the quality of your pool & spa water. The color scale shows directly how the results should be rated. [FAST & SAFE] Lab-tested and with German and English instructions [EASY TO READ] Excellent color scale. Fast and accurate – Get precise test results in seconds. Simply dip the strip in water and compare it to the large color chart on the bottle. [OPTIMAL MEASURING RANGE] Total hardness: 0 to 1000 ppm. Free chlorine: 0 to 10 ppm. Total chlorine: 0 to 10 ppm. Cyanuric acid: 0 to 240 ppm. Total alkalinity: 0 to 240 ppm. pH value: 6.2 to 9.0