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#1
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![]() have a Hannah instruments TDS meter will trade for a good PH pen. its this one:
http://www.hannainst.com/USA/prods2....ode=HI%2098311 ![]() really just want a ph pen, but would sell for $80 Last edited by adidas; 10-10-2009 at 04:53 AM. |
#2
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![]() I had a ph pen for a bit, it ended up in the garbage. only had 1 point calibration.
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Two clownfish were in a tank. One says to the other, how do i drive this thing? |
#3
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![]() can i buy it off u
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#4
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