What Michael and Janet said:

DPD-FAS kits (different from DPD tablets) are mostly a Taylor product. Ben uses the DPD-FAS test for chlorine in his kit. So does the Taylor 2006 kit, and Leslie's sells a DPD-FAS kit under its own brand that's the Taylor kit.

DPD-FAS measures Free Chlorine (FC--the good stuff) and Combined Chloramines(CC-the used up stuff that smells like chlorine)

Total Chlorine (TC) is the sum of FC and CC.

Best is when CC=0.

The pH test from any of these, or even from the little $7 OTO/pH test kits is FINE and will do the job.

Don't rely on test strips--they are inaccurate.

Good luck!