Aqua Chek Aqua Chek Yellow Test Strips Free Chlorine， 50 Strips<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Aquachek yellow test strip</li><li>Quick and easy water testing; no mess</li><li>Gives accurate results</li><li>Results appear in just 30 seconds</li><li>Test for Free Chlorine， pH， Total Alkalinity， &amp; Stabilizer</li></ul></div><img src="http://ecx.images-amazon.com/images/I/51Fj2sFuBVL.jpg" noproxy>