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    Can PPM or EC be measured with a volt meter

    Hello getting ready to purchase a ppm meter, probably one of the 15 to 20 buck ones on ebay. Anyway since a volt meter measures resistance couldn't that be used to measure ppm?
  2. D

    Can you use an HPS bulb in a MH ballast

    Hello was reading that you could use a MH bulb in HPS ballast or vice versa long as they are same wattage is this true....thanks.....Dimebag
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