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Old 01/15/2020, 08:05 PM   #1
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Join Date: Jan 2014
Posts: 767
Different Calcium test results?

I checked my calcium levels with

Api -- I think actually API changed there kit it says CA2+ now anyway this reads 440 (What I was expecting)

Hanna showing 474 --- I am guessing this is perhaps need of calibration?

Can API actually be more accurate than Hanna? The Hanna kit is a pain in the butt if you ask me.

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Old 01/15/2020, 08:35 PM   #2
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Join Date: Mar 2002
Location: Mountain View, CA, USA
Posts: 88,537
Those are actually reasonable close, for hobbyist kits. The Hanna meter, if that's what you are using, has some issues with accuracy, according to a lot of reports. I would go with the API, personally, but both readings are acceptable.

Jonathan Bertoni
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Old 01/20/2020, 02:32 PM   #3
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Join Date: Oct 2002
Location: Dewitt MI
Posts: 5,038
For calcium I prefer, and use, Salifert.


180 gallon, 40 gallon sump, 3 250 W MH + 4 80W ATI T5's, MTC MVX 36 Skimmer, Apex controller Aquamaxx T-3 CaRx

Current Tank Info: A 2 Barred Rabbitfish, Red Head Salon, Yellow/Purple, McMaster Fairy, Possum, 2 Leopard Wrasses, Kole, & Atlantic Blue Tangs, 2 Percula Clown, 3 PJ and 1 Banggai Cardinalfish , Swallowtail, Bellus and Coral Beauty Angels
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