Jag kör med denna: http://www.aquaristic.net/shop.php/sid/e9ae66de6e3dba7bf2b6c6c1d653da56/cl/details/anid/f55457442f40ac053.86160144/pgNr/1/Aqua%20Light%20pH_CO2-Controller%20-%20SONDERPREIS//listtype/search/searchparam/controller och det funkar klockrent!