Didn't I just say that????

Actually, Evan gave you the details--i thought DPD bleached at 15, he says 10. Doesn't matter, I no longer use DPD and don't recommend it--I use OTO or FAS-DPD.

The BEST OTO kit I've ever seen is Ben's PS-200 included in the PS-233 kit. It uses Taylor R-0600 for OTO and R-0014 for pH and the Taylor small cell (as opposed to the big one that was in the PS232) and works better than the other OTO kits I've used. It goes to 5 on TC (which is better than 3).

I presume other kits that use these same 3 items are interchangeable.

I haven't noticed a significant difference between any of the FAS-DPD tests.