The InstaTest® Pool 4 Plus pool & spa strip measures Free Chlorine 0-10 ppm, Bromine 0-20 ppm, Total Alkalinity 0-240 ppm, pH 6.2-9.0, and Cyanuric Acid (Stabilizer) 0-250 ppm. This test strip is a dip-n-read strip with instant results. The InstaTest® POOL 4 Plus strip is ideal pool strip allowing the user to measure the most important test factors. Each bottle includes 50 test strips packaged in a waterproof PopTop bottle with a molded desiccant liner, which protects the strips from moisture and UV light. This product is available with trilingual (English, Spanish, French) instructions.