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I went with the Hannah for a while because it's fast and easy and would use Salifert to back check if the numbers were wonky.I was going to suggest that you have Salifert test kits on hand to check your Hannah, but then I wondered if you had the Salifert, then what good is the Hannah?
I would not trust ICP over a Salifert test kit, either. If I understand it right, the plasma cannot detect carbonate hardness and they use a test kit just like you would - one of the many reasons for the two vials. Some companies have more sophisticated testing equipment for things like kH and Calcium but since they are black boxes, we are left to guess at what they use. They totally could have a person using a Salifert test kit.