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    …Marin Hydrometer comes in. The Tropic Marin High Precision Hydrometer provides an exact and reliable measurement of specific gravity, and it never needs to be re-calibrated, so it's a perfect reference device for calibrating other equipment. * High precision hydrometer for determining…

    $31.25 Regular Price: $

    Why does BRS recommend this? If you have been using a hydrometer and have never tried a refractometer then you should really invest in one.  They use much less water, and can easily be calibrated for accurate repeatable readings.  For the most accurate readings  you will want to…

    $34.99 Regular Price: $

    …|  35ppt  |  53µS   Two Sizes Available * 60mL - great for refractometers * 250mL - ideal for hydrometers   Calibration of any testing device is required and the more often you perform calibration procedures the more accurate your…

    $5.49 Regular Price: $

    …Thousand of saturated salt. This is the oldest of the 3 seawater measurements scales * S.G. - The current standard of Specific Gravity hydrometers and refractometers.   The Milwaukee Instruments MA887 digital refractometer is easy to calibrate and easy to read and provides…

    $124.99 Regular Price: $
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