TAYLOR TECHNOLOGIES INC K-1770 TEST KIT CALCIUM HARDNESS<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>• 1 drop = 10 ppm calcium EDTA titration (includes inhibitors to prevent metal interference)</li></ul></div><img src="http://ecx.images-amazon.com/images/I/414lShUEY-L.jpg" noproxy>