Originally Posted by It's 5 o'clock somewhere

I will need a meter I guess, I'm red green color blind and after I add the nutes I can't get it to match anything on the color chart. That's what got me in trouble in the first place. After spending $650 on my set up I guess another $100 for a meter won't kill me, but loosing the whole crop would! Thanks for the info and I will keep this string updated with progress and pics.