ph, tds meters?

Discussion in 'Growing Marijuana Indoors' started by nickel, Mar 17, 2007.

  1. So I need to buy pH and TDS readers... I've heard that some are shit though (eg: $10 soil testers). :p I've been looking on eBay and found these. Are these pen-type meters a waste of money for a soil grow? Can I stay under $100 for a decent all-in-one?
    (by the way, these are about $20 each)

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