511242A YELLOW Insta-Test 4 Strips tests the following:

Free Chlorine 0-10 ppm (or Bromine 0-20 ppm)

pH 6.8-8.4

Total Alkalinity 0-180 ppm

Total Hardness 50-800 ppm

50 strips in each vial
NOTES: Pool and spa owners are always looking for something quick and easy. It's an unbeatable test system: no caps to worry about and even greater moisture protection. We guarantee the Insta-Test® pool and spa strips will help the user maintain proper free chlorine levels and balanced water. NOTES: The only strip with no required waiting period. Just swirl 3 times and read! PopTop caps are easy to open and shut - guaranteed for 1,000+ openings. The patented vial has a molded desiccant liner, protecting the strips from moisture intrusion and eliminating loose desiccant bags. Measures free chlorine or bromine on one strip.