Phosban-reactor with Rowaphos question

[Delphinus]

Whatcha using for testing? I'm using Elos phosphate test kit. Unfortunately the levels are 0, 0.1, 0.25, and then up from there. So more less I need to get the test reading from the second-faintest hue-of-blue to the least-faint hue-of-blue without actually being perfectly clear. I hate these colour coded test kits, I wish there were more titration type tests (where you count the drops until a colour change ... far less subjective).

I'll have to dig through my drawer-o-testkits but I think I have some other older PO4 test kits, Seachem and Salifert, in there.. hoping between the 2 or 3 test kits I can worry less about guessing colours and feel better about my guesses of the results.. I'm terrible at comparing colours...