Does your test kit use the same larger comparator tube for testing pH, TA, and CH and use the small chlorine tube for the CYA test? If so then you have the K-2005 and you might seriously consider addding a stand alone FAS-DPD test since that is the only test that is different in the better K-2006 kit.
If your test kit has a small tube for the pH test (same size as the chlorine test) and a separate large tube for the TA and CH tests then you might want to consider getting a K-2006. It is a much better test kit.