The R-0002 is one of the two reagents used to test for FC in the Taylor K-2005. This kit is supplied with liquid reagents and uses a color comparator tube for the chlorine tests. The K-2006 is the one that comes with DPD powder R-0870 and the liquid reagents R-0871 and R-0003 for the FC and CC test. The testing method is a titration where you count drops until you get a color change.

The R-0002 is not the same as the powder. You use it in combination with the liquid R-0001 for chlorine testing with a K-2005 kit.

Instructions for the K-2005 are here: http://www.taylortechnologies.com/pr...er&Number=5136 .
Instructions for the K-2006 are here: http://www.taylortechnologies.com/pr...er&Number=5138