Hydrometers & Refractometers

Salinity is one of the most fundamentally important water parameters we track in our saltwater aquariums. There are several ways to measure salinity or specific gravity. Hand-held refractometers are popular due to their ease of use and low cost, but digital salinity testing devices are gaining popularity. No matter how you want to measure salinity, we have the tools for the job.
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17 Items

  1. 25-Pack HI70024P 35ppt Salinity Calibration Sachet
    Hanna Instruments
    25-Pack HI70024P 35ppt Salinity Calibration Sachet
    $27.00

    $27.00
    Add to Cart
  2. PINPOINT Salinity Calibration Fluid
    American Marine Inc.
    PINPOINT Salinity Calibration Fluid
    $10.79

    $10.79
  3. Marine Master Bluetooth Multiparameter Photometer HI97115
    Hanna Instruments
    Marine Master Bluetooth Multiparameter Photometer HI97115
    $449.95

    $449.95
  4. True Seawater Refractometer - D-D The Aquarium Solution
    D-D The Aquarium Solution Ltd
    True Seawater Refractometer - D-D The Aquarium Solution
    $69.99

    $69.99
  5. Marine Monitor (pH/Salinity/Temperature)
    Hanna Instruments
    Marine Monitor (pH/Salinity/Temperature)
    $249.00

    $249.00
  6. PM2 Salinity Module
    Neptune Systems
    PM2 Salinity Module
    $94.99

    $94.99
  7. Replacement LED Cover for Refractometers
    Bulk Reef Supply
    Replacement LED Cover for Refractometers
    $4.99

    $4.99
  8. Single HI70024P 35ppt Salinity Calibration Sachet
    Hanna Instruments
    Single HI70024P 35ppt Salinity Calibration Sachet
    $1.28

    $1.28
  9. Neptune Systems Conductivity Calibration Solution - 53000 Microsiemens
    Neptune Systems
    Neptune Systems Conductivity Calibration Solution - 53000 Microsiemens
    $2.99

    $2.99
  10. Lab Grade Conductivity/Salinity Probe
    Neptune Systems
    Lab Grade Conductivity/Salinity Probe
    $209.99

    $209.99