The Taylor K-2006 for chlorine tests Free Chlorine (FC), Combined Chlorine (CC), pH (with acid/base demand tests), Total Alkalinity (TA), Calcium Hardness (CH), and Cyanuric Acid (CYA). The Taylor K-2106 for bromine tests Total Bromine (TB), pH (with acid/base demand tests), Total Alkalinity (TA) and Calcium Hardness (CH).
Unless you have a plaster spa or one with tile that has grout, then you don't need to test for CH unless it's high from the fill water (so you'll know if you risk getting scaling) or unless you intend to add CH to 150 ppm to prevent foaming.