(no subject)

[BlueZquirrel]

I'm not at home, so I don't have the kits in front of me. One of them is from Hagen, another is a quick dip strip, and I can't remember the other two. I test them at the same time to see if they agree with each other and they usually don't. The readings range from 20 to 90. I'm trying to reduce my nitrates, so this testing is important to me. I just don't know which test to trust!
Tracy