(11/14/2007) - I like the product and it works decently enough, problem I have is that in the description above, I was lead to believe this unit read PH, TDS, and EC. Which of course it does not, only PH. I guess I could have read a little closer to the description above and realize that they were just talking about all the various testers this company has, but was still a little upsetting. Maybe a webmaster can add an appropriate description for THIS product instead of a compilation of info for all of them.