The Insta-TEST® salt (Sodium Chloride) pool & spa strip by LaMotte measures from 1500, 2000, 2500, 3000, 3500, 4000, and 5000 ppm. This test takes only 20 seconds to read with results that are easy for you to understand! The bottle includes 10 individual strips packaged in a waterproof Pop-Top container which also protects against moisture and UV light. Waterproof bottle with hinged cap and stay dry liner.