Hi Guys, would this be a good TDS ppm Meter?

http://cgi.ebay.com/Hanna-TDS-METER-...QQcmdZViewItem

If I'm going to make this work I'm going to have to get better equipment I think. I'm down to 3 plants now. 2 are looking pretty good, although they are real light green in color. The third has been the runt from the get go although it's still hanging in there, not sure for how long.