Again, with ppm you have to know what EC to ppm conversion the manufacturer is using. Hydro-Gardens uses .70 Truncheon and General Hydroponics uses the more popular .50 Hanna.
Mike at Hydro-Gardens uses and sells Myron meters that read .70 Truncheon. This is probably why he gets all these, "My PPM is too low." questions in the FAQ. We talked about this a couple weeks ago, he agreed and thought he'd note that going forward.
I'm sure you probably know this already Mitch, and was more for those tuning into the thread late.
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