We have used the Hanna combo meter like that and works very well.

But you can get milwakie ph meter for about 20 bucks and a TDS meter for about the same. We use them more than anything and are happy with them . the combo is just a backup. An expensive one at that.AquariumPlants.com Largest online sales / service site for the live aquarium plants & aquarium products community.

Here is a good place to get a ph meter. if you look around you can find a tds for not too much also. This meter has been used by my bro for 2 years and me for over a year. You will need calibration solution also so check what kind you need. I think 7.01 is what it is.
LOC NAR on probation Reviewed by LOC NAR on probation on . Six Plant Rubbermaid DWC Hello everyone, I currently have a 3ft X 2ft X 6in tray that I use for ebb and flow with a 14 gallon reservoir underneath it. I built the system with rubbermaid containers, and did not put much consideration into complete drainage. The fill/drain fittings are right in the middle, causing a small layer of water to remain for most of the day, every day. In the future i will place the fittings on one end of the tray, and have the other end slightly elevated, to force all water to drain to one Rating: 5