I already said this in your other thread, but in case anyone cares and doesn't get over that way,

I have an inexpensive Control Wizard for both PPM and PH (two pens). As far as I know they've never done me wrong.
Opie Yutts Reviewed by Opie Yutts on . PH/EC Testers. What Do You Use? And do you love them, hate them or could take or leave them? Which ones do you guys think are the best and the worst? Fast or slow? Easy or hard to read? How about to calibrate and store? ALL meters...ph, ec and/or tds any info would be great. :thumbsup: Thanks. :jointsmile: Rating: 5