Aquachek Yellow Pool &amp; Spa Test Strips<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Results in seconds</li><li>Tests for Free Chlorine， Cyanuric Acid， pH and Total Alkalinity</li><li>50 strips per bottle</li></ul></div><img src="http://ecx.images-amazon.com/images/I/51JP4z%2B77sL.jpg" noproxy>