K2005 vs K2006 vs K2006C test kits

[rob001]

Can anyone tell me the difference in the Taylor K2005 and K2006 test kits? They also offer the same part numbers with a "C" on the end. Any help is appreciated.

[PoolDoc]

The K2005 is a color-matching DPD test that is practical only to about 5 ppm chlorine; over 10 ppm of chlorine, it begins to read LOWER, rather than higher.

The K2006 replaces the color-match test with the DPD FAS test which is accurate up to around 50 ppm of chlorine.

The 'A' version of the kits (or the K2005 / K2006 with no letter) have 3/4 oz reagent bottles. The 'C' versions have 2 oz bottles, or about 3x as much for less than 2x the price.