If you want a combined one for under $200, I heard the Milwaukee SM802 is the best.

That being said, I talked to the company that makes the meters Image Reaper told you about. They said that a combined probe is not a good idea, further built-in temperature is important because the meter should compensate for the actual temperature to give you a reading that is compatible with the nutrient guide (which is based upon ppm @ 25C).

Good luck.
herbie the love bud Reviewed by herbie the love bud on . Good to go with this meter? Hey guys, What do you think of this unit? I mean I'm a little confused as to what the diff between ppm, EC, and TDS is... it's all greek but this has it all so I figured I would be ok with it. Also if anyone would like to explain the diff with all that, that would be sweet! :D HANNA HI991404 pH/EC/TDS/T Monitor, GroChek HI 991404 - (eBay item 280163600407 end time Oct-25-07 22:34:12 PDT) Rating: 5