Sorry my mistake, what I have is the Taylor K-1003. All it does is pH, chlorine (OTO drops), Alk, acid demand and base demand. All I am using it for is the pH, chlorine and alk.

With regard to the other question, will the CYA trend down over time? I have an autocover so I don't add replacement water much to compensate for evaporation. Something tells me I will not be using much Tri-chlor going forward because I do not want to let my CYA get over 50.