Blue Devil B7773 8-Way Pro DPD-No.1 and No.3 Tablets<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Tests for free chlorine/bromine; total chlorine; pH; alkalinity; acid demand; base demand; chlorine stabilizer and calcium hardness</li><li>Easy to read color comparator</li><li>Complete instructions and a convenient plastic storage case included</li></ul></div><img src="http://ecx.images-amazon.com/images/I/51KT7qEUJ1L.jpg" noproxy>