Check the listing for details. AquaChek Yellow Test Strips with Chlorine - 50 Count 4 Pack. Condition: New. Listed at 32.99 USD. 💦Ships as (4) bottles and each bottle contains 50 strips 💦Test your pool water for Free Chlorine, Total Alkalinity, Cyanuric Acid (Stabilizer) & pH levels with AquaChek Yellow! 💦AquaChek Test Strips are manufactured by the industry leader: Environmental Test Systems (ETS). 💦Simple, fast, and accurate! Get your result in only 15 seconds. 💦Easy to use! Simply dip the test strip into the water. 💦50 Test Strips per bottle💦Ships as (4) bottles and each bottle contains 50 strips 💦Test your pool water for Free Chlorine, Total Alkalinity, Cyanuric Acid (Stabilizer) & pH levels with AquaChek Yellow! 💦AquaChek Test Strips are manufactured by the industry leader: Environmental Test Systems (ETS). 💦Simple, fast, and accurate! Get your result in only 15 seconds. 💦Easy to use! Simply dip the test strip into the water. 💦50 Test Strips per bottle