Spend the money get the C kit.
Buy the Commercial kit aka C kit if you need glasses. The instructions on the inside lid are much bigger on the Commercial Kit and that is the guide to how to use. Also the K-2006C kit does not do bromine and the Chlorine is a little more involved than the K-2005C which only gives you Chlorine/Bromine readings in 1, 2, 3, 4, and 5 ( which could be much more than 5 ). K-2006C did do a .2 or .5 resolution Chlorine depending on sample size. And K-2006C was easier for combined chlorine as K-2005C is wait and see if there is a color shift. Also my 2006C kit had the instructions on the lid for salt and a space to put the salt regents and tube. The K-2005C is a little faster and easier to use with R 0001, 0002, 0003 droppers and mach on color scale but the K-2006C is a little more detailed using R-0870 powder that must remain dry then you bleach it out with R-0871 dropper counting the drops til clear and that is the chlorine X.2 or X .5 drops then R0003 and re drop R-0871 til clear for combined chlorine.
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