1. You may be able to find a infant dosing syringe at the drug store that will allow you measure a 5ml sample; that would give you a fairly accurate 1 drop = 1 ppm test. Alternatively, you can match OTO tests with the DPD-FAS results till you learn what the colors look like -- obviously, this is rather approximate.

2. High chlorine converts phenol red to chlorophenol red, a different indicator. But when high CYA is present it does so a bit slowly. So, take your INITIAL pH result.