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jetboatjoe
02/17/2010, 12:46 PM
What are the differences in ph probs, besides price? Lab grade is best, but there is big price difference in the standard. Saw some on ebay for a little as $15!!

jetboatjoe
02/17/2010, 03:08 PM
bump

jetboatjoe
02/17/2010, 04:45 PM
Which ones have you purchased, factory or aftermarket?