- Description Chlorine, Bromine, Alkalinity, pH, Total Hardness The Insta-TEST 4 Plus pool and spa strip measures: Chlorine 0-10 ppm Bromine 0-20 ppm Total Alkalinity 0-240 ppm pH 6.2-9.0 Total Hardness 0-800 ppm. This test strip is a dip-n-read strip with instant results. Each bottle includes 50 test strips packaged in a waterproof PopTop bottle with a hinged cap. The bottle has a molded desiccant liner, which protects the strips from moisture and UV light. The Insta-TEST 4 Plus strip is ideal for spa owners who need the most critical tests for perfect water balance.