Refractometers

  1. Salinity Meter: Calibration and How to Care for One

    Salinity Meter: Calibration and How to Care for One

    Hanna Instruments Salinity Tester (HI98319), Apex Salinity Probe / Lab Grade Conductivity Probe and IceCap Salinity/Temperature Digital Pocket Tester In a previous article we explained how to use a...
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  2. How to use a Refractometer to Measure Salinity

    How to use a Refractometer to Measure Salinity

    In the early days of the hobby, we’d use a floating glass hydrometer to measure the specific gravity in our tanks and when mixing up saltwater. The strength of the seawater determines how high...
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