Checked the pool chlorine 3 different ways today. By the TF-100 my readings were as follows:
FC 4.5 (by FAS-DPD)
That all looks good but to make a comparison I also did the Basic OTO TC test using the Taylor K-1000 kit included with the TF-1000 and that gave me a reading of TC at 2.0??? Also checked an AquaChek strip and that gave me a reading of 5.0
So how much chlorine do I have in the pool? 4.5 or 2.0? I presume the FAS-DPD is the gold standard but not sure why the OTO test was so poor? The strips might be better for a daily chorine check and reserve the FAS-DPD for once per week.