The Taylor 2006 is the equivalent of the PS234. Taylor also makes a salt test kit that is separate. Together they are the equivalent of the PS234S.

Leslie's also sells on-line a similar kit--the FAS-DPD Chlorine Service Test Kit. Add the Leslie's Salt test kit and it's the same. Leslie's kits use the same Taylor chemicals as the Taylor kits, so they are the equivalent of the Taylor and the PS234.

I have the PS233, but I also have the following Leslie kits that perform the same functions, plus:
1) FAS-DPD Chlorine Test kit (just tests Chlorine).
2) General Service kit (OTO Chlorine, but neutralized pH, Cal, CYA, T/A and the useless acid and base demands).
3) Salt test kit (just tests salt level)
4) Copper test kit (just tests copper level).