i appreciate all of the explinations rusty, lord knows i need them!

quick question for you, i'm looking at pH test kits locall y. this one is at petco. it's a little confusing. it says "....for pH level from six." but then in the description it says 0-7. i've included the link and would appreciate any feedback before i go buy one.

most i see are for a very specific range.

thanks again!

-shake