I have a Hanna Alk digital and I'm very happy with it, simple and quick to use. I haven't used the Calc but I have also read that they are a pain to use.
Hanna for Alk, your most important reading. Whatever for Ca. I use API for Ca cause its cheap, and in only measure it once per month. I know... some API haters out there but for Ca they do the trick just fine.
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