The CYA view tube that comes with the TF-100 can measure down to 20, the one that comes with the k-2006 can only measure down to 30. You want your level high enough to get a reading so if you are using the k-2006 then you will need to bring it to 30. Unfortunately TFTestkits cannot ship Taylor chemicals outside the US, but you might contact them about possibly getting a view tube and mixing bottle. Not sure shipping costs would make it worthwhile but it is one option if you would rather keep your CYA lower. Truthfully though, the difference between maintaining at 20 CYA and 30 CYA are minimal.