Red Sea test kit readings...

[Haulin Oates]

Having a hard time figuring out these tests lately. It used to be really easy to tell what color matched, but since I've been getting my levels down, I've had the hardest time... And now today I got some funky readings:

this is phosphates against .04 on the wheel

this is phosphates against .08 on the wheel. I think it's closest to .08, but it looks really close from 0.00 all the way to .08...

and here's my nitrate. It's blue... Doesn't really match anything on the wheel, closest to 0.00, but it never even changed colors...
Am I going blind?

 

[DyM]

For PO4, seems to be between those... .06? PO4 with all test kits are hard to read at the low end. Salifert is impossible; that's why the Hanna meter is such a hit. For NO3, from the pic, to the right seems blueish. That's less than 1ppm, no use splitting hairs on that.