for trade TDS meter for a PH meter

[adidas]

have a Hannah instruments TDS meter will trade for a good PH pen. its this one:

http://www.hannainst.com/USA/prods2.cfm?id=003003&ProdCode=HI%2098311

http://www.hannainst.com/images/imgHI_98311_lg.jpg

really just want a ph pen, but would sell for $80

[Kryptic4L]

I had a ph pen for a bit, it ended up in the garbage. only had 1 point calibration.

[jalemboo]

can i buy it off u

[adidas]

can i buy it off u
buy me a ph one and i'll trade?