Arch Chemical TV205159 HTH Shock Test Strip<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>The product is a hth shock test strip</li><li>Purpose of use for pool and spa supplies， chemicals &amp; water testing - swimming-pool-testing-strips</li><li>Manufactured in china</li></ul></div><img src="http://ecx.images-amazon.com/images/I/41lN4wBoKUL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41lN4wBoKUL.jpg" noproxy>