Potassium Kits

Which is the preferred kit? I was using Salifert but can't find them anywhere now.

Here, in spain, very difficult to find salifert potassium test too...

From my understanding the K test kit has been discontinued. This really stinks, cause after using many others, I found it to be the easiest. I have the Red Sea Coral Pro K test kit, but it is a bit tedious.
 
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