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Hydrometers & Refractometers

Hydrometers and refractometers are instruments used to measure the specific gravity of your saltwater or the ratio of the density of the liquid to the density of the water. Bulk Reef Supply carries the Red Sea Hydrometer with Integrated Thermometer and the Milwaukee Digital Seawater Refractometer.

Hanna Salinity Checker

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  1. Refractometer for Reading Salinity with Calibration Fluid - Bulk Reef Supply
    Bulk Reef Supply
    Refractometer for Reading Salinity with Calibration Fluid - Bulk Reef Supply
    $29.74

    Earn 145 Reward Points Earn 290 Reward Points

    $34.99
    Add to Cart
    Add to Wish List
  2. LED Refractometer for Reading Salinity with Calibration Fluid - Bulk Reef Supply
    Bulk Reef Supply
    LED Refractometer for Reading Salinity with Calibration Fluid - Bulk Reef Supply
    $33.99

    Earn 165 Reward Points Earn 330 Reward Points

    $39.99
    Add to Cart
    Add to Wish List
  3. BRS Refractometer Calibration Fluid 60 ml / 2 fl. Oz.
    Rating:
    60%
    6 Reviews
    Bulk Reef Supply
    Refractometer Calibration Solution - Bulk Reef Supply
    $5.94

    Earn 25 Reward Points Earn 50 Reward Points

    $6.99
    Add to Wish List
  4. MA887 Digital Seawater Refractometer - Milwaukee
    Rating:
    90%
    118 Reviews
    Milwaukee Instruments
    MA887 Digital Seawater Refractometer - Milwaukee
    $89.00

    Earn 445 Reward Points Earn 890 Reward Points

    $124.99
    Add to Wish List
  5. HI98319 Marine Salinity Tester - Hanna Instruments
    Rating:
    75%
    26 Reviews
    Hanna Instruments
    HI98319 Marine Salinity Tester - Hanna Instruments
    $58.65

    Earn 58 Reward Points

    $69.00
    Add to Wish List
  6. High Precision Hydrometer - Tropic Marin
    Rating:
    97%
    6 Reviews
    Tropic Marin
    High Precision Hydrometer - Tropic Marin
    $31.25

    Earn 31 Reward Points

    $31.25
    Add to Wish List
  7. Salinity Module: PM2 - Neptune Systems
    Rating:
    71%
    9 Reviews
    Neptune Systems
    PM2 Salinity Module - Neptune Systems
    $76.46

    Earn 76 Reward Points

    $84.95
    Add to Wish List
  8. Lab Grade Conductivity/Salinity Probe - Neptune Systems
    Rating:
    52%
    48 Reviews
    Neptune Systems
    Lab Grade Conductivity/Salinity Probe - Neptune Systems
    $112.46

    Earn 112 Reward Points

    $124.95
    Add to Wish List
  9. SAL-1700 Salinity & Temperature Testing Pen - HM Digital
    Rating:
    60%
    3 Reviews
    HM Digital
    SAL-1700 Salinity & Temperature Testing Pen - HM Digital
    $59.49

    Earn 59 Reward Points

    $69.99
    Add to Wish List
  10. PINPOINT Salinity Monitor - American Marine Inc.
    Rating:
    83%
    7 Reviews
    American Marine Inc.
    PINPOINT Salinity Monitor - American Marine Inc.
    $110.49

    Earn 110 Reward Points

    $129.99
    Add to Wish List
  11. Replacement LED Cover for Refractometers - Bulk Reef Supply
    Rating:
    53%
    3 Reviews
    Bulk Reef Supply
    Replacement LED Cover for Refractometers - Bulk Reef Supply
    $4.24

    Earn 20 Reward Points Earn 40 Reward Points

    $4.99
    Add to Wish List
  12. Refractometer & Hydrometer Calibration Standard - Brightwell Aquatics
    Rating:
    60%
    2 Reviews
    Brightwell Aquatics
    Refractometer & Hydrometer Calibration Standard - Brightwell Aquatics

    Starting at: $4.39

    Earn 20 Reward Points Earn 40 Reward Points

    Choose Options
    Add to Wish List
  13. Hanna Instruments HI70024P 35 ppt Salinity Calibration Solution Sachets
    Rating:
    60%
    1 Review
    Hanna Instruments
    Single HI70024P 35ppt Salinity Calibration Sachet - Hanna Instruments
    $0.89 $1.05
    Add to Wish List
  14. 25-Pack HI70024P 35ppt Salinity Calibration Sachet - Hanna Instruments
    Hanna Instruments
    25-Pack HI70024P 35ppt Salinity Calibration Sachet - Hanna Instruments
    $22.10

    Earn 22 Reward Points

    $26.00
    Add to Cart
    Add to Wish List
  15. Neptune Systems Conductivity Calibration Solution - 53000 Microsiemens
    Rating:
    77%
    7 Reviews
    Neptune Systems
    Neptune Systems Conductivity Calibration Solution - 53000 Microsiemens
    $2.66

    Earn 2 Reward Points

    $2.95
    Add to Wish List
  16. PINPOINT Salinity Calibration Fluid - American Marine Inc.
    Rating:
    83%
    15 Reviews
    American Marine Inc.
    PINPOINT Salinity Calibration Fluid - American Marine Inc.
    $7.64

    Earn 7 Reward Points

    $8.99
    Add to Wish List
  17. Milwaukee Protective Hardshell Case for Refractometer
    Rating:
    91%
    15 Reviews
    Milwaukee Instruments
    Milwaukee Protective Hardshell Case for Refractometer
    $20.39

    Earn 100 Reward Points Earn 200 Reward Points

    $23.99
    Add to Wish List
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