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just thought i'd share this with everyone. i found used 400watt HPS lights on ebay for $25 each. the listing says local pickup only but then it says buyer pays all shipping. i bought one and i'm waiting to hear back from the guy about shipping. they're listed under 400watt high bay lights. they...

Hows it going, Im looking into going to a DWC system but can't figure out which type of meter to buy to measure the ppm. Any help on this would be great. Thanks