that's a good post I wouldn't mind some info. Not that I don't love trying to match the colors but as far as TDS I too am still in the dark.

Unless you are going into commercial production, a separate TDS and Ph meter work just as well and are lots less expesive.

Hanna makes the ones I use and they cost $50/meter.

Well, I broke down and (re)searched around, See Link Below.

It seemed to be the best bang for the bucks. I figured if I were to spend 100$ on 2 individual meters (around 50$ each).. I might as well spend 140$ and get all 4...

At this point the only thing I can't measure is Dissolved Oxygen, but I'm really not that worried, got 2 12" airstones running in my 25 gallon tank..

Anyone using this meter? looks pretty good to me, hopefully I didn't just make a bad choice. :D

L8r all.

Here is a link that might be useful: Hanna Gro'Chek Continuous pH/TDS/EC/Temp

Ive got a Milwaukee sm802 ph/tds/ec meter. I bought it used for 100. it works great, is super easy to use, and many consider it a standard. In the future though, when i have the bux, I'll get a Tri-Meter by Nutradip. It just sits on your res and has a lit digital read of your PH, TDS, and Temp. This way you can just walk in, and see right away that everything is okay. Instant info, pre-calibrated ready to roll & between 200 and 250. Just found a link with one for 190.

Here is a link that might be useful: ebay!

posix337
How does your Hanna Gro'chek meter work? Are you satisfied with it? I am looking at the same meter and would like some feedback from someone with experience with the meter.