Been looking at these, seems an easier and more accurate way to keep an eye on things
http://www.dennerle.de/en/index.php?option=com_content&view=article&id=141:co2-langzeittest-correct-ph&catid=123:profi-line&Itemid=153
Does anyone else use these?
http://www.dennerle.de/en/index.php?option=com_content&view=article&id=141:co2-langzeittest-correct-ph&catid=123:profi-line&Itemid=153
Does anyone else use these?