I love the hannas. If nothing else, get the hanna po4. I've had troubles with the elos mg and switched to seachem. Seemed very complex for the first test (i was 55 days setuo into a stretch of night shift) but I really like it now. If you get the hanna ca, it takes a bit to get used to. You have to be very accurate with your testing methods. I vote hanna for all of them... If you're going to skip one, skip the ca, and go elos.
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