Are they any good? I need one to test KH and I want one that is simple (like me) and accurate. From what I've seen on-line this one looks pretty straight-forward.
I had good experiences with the elos kits. Better then salifert imo.
I think the ca++ (calcium) kit is much better then any I have used.
The k+ (potassium) I haven't tried yet. The kz one worked for me but I need a new kit. I will order it and see how it is with my next online purchase.