HI758 Marine Calcium Checker Review

Discussion in 'Hanna Instruments' started by Hanna Instruments, Feb 8, 2018.

  1. Hanna Instruments

    Hanna Instruments Active Member R2R Supporter Platinum Sponsor Article Contributor

    Feb 16, 2017
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    Woonsocket, Rhode Island
    Check out this review on our HI758 Marine Calcium Checker for Reefs.com


    The HI758 Marine Calcium Checker HC® requires deionized or distilled water absent of calcium to function correctly. Calcium can be found in many freshwater sources and this any amount present in the water used at C1 phase can cause false high readings. In addition, many hobby grade reverse osmosis deionized water systems may not adequately remove calcium. We recommend using deionized water with low conductivity or pure vapor distilled water commonly found in most pharmacies.

    Never use tap water to clean your cuvettes. This is especially important for the HI758 Marine Calcium Checker as calcium is commonly present in tap water and residual amounts present in the cuvette will elevate results produced by the Checker.

  2. TheEngineer

    TheEngineer Formerly icecool2 R2R Supporter R2R Excellence Award Reef Squad Showcase Editor Build Thread Contributor Delaware Reef Club

    Nov 26, 2011
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    I have this checker and I’m concerned with my results. The variables seem pretty high to me. What if I don’t get all of the grains in from the packet? What if I put slightly more or less RODI water in the cuvette? At 100:1 concentration of RODI to sample this test seems really likely to be off.

    What are the error bounds?
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