The Insta-TEST® PRO Phosphate High Range pool and spa test strip measures Phosphate levels from 3,000 ppb, 6,000 ppb, and 12,000 ppb. The Phosphate test strip is a reagent-delivery style strip with results in less then 15 seconds. The bottle includes 25 strips packaged in a waterproof PopTop bottle that has a molded desiccant liner, which protects the strips from moisture and UV light. The Insta-TEST® PRO Phosphate product is packaged 6 bottles per case.