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Salinity

Specific gravity is the measure of relative salinity or the amount of dissolved salts in your aquarium water in comparison to pure water. Being reef aquarists you all be aware of the importance of maintain a constant specific gravity in order not to stress the inhabitants of your aquarium. Measuring specific gravity on a regular basis is essential to keep up the idyllic environment for your aquatic inhabitants. It is important that you never ignore this fact even if sometimes you might think it is not as important compared to the other factors that need to be taken care of in a reef tank.

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  • On Sale 15%
    HI98319 Salinity & Temperature Tester - Hanna
    On Sale 15%

    HI98319 Salinity & Temperature Tester - Hanna

    Hanna Instruments

    $79.99
    $67.99
    We are pleased to announce our NEW HI98319 waterproof salinity and temperature tester! Waterproof and floats! Includes 4x of the Salinity Calibration Fluid Packets. Automatic Calibration – A 35.00 ppt solution is used for calibration and...
  • On Sale 15%
    Salinity Refractometer - Generic
    On Sale 15%

    Salinity Refractometer - Generic

    All Misc Brands

    $29.95
    $25.46
    It is designed for testing the concentration of salt water and brine and used for quality control in research and clinical laboratories and marine industry. Its scale provides a direct reading of the specific gravity and concentration (part per Thousand)...
  • On Sale 15%
    Digital Seawater Refractometer MA887 - Milwaukee
    On Sale 15%

    Digital Seawater Refractometer MA887 - Milwaukee

    Milwaukee Instruments

    $114.00
    $96.90
    This refractometer does not come with a case or battery. The new Milwaukee MA887 Seawater Digital Refractometer encompasses 3 different types of user selected scales for the measurement of seawater providing for a much more precise evaluation. Each...
  • On Sale 15%
    HI97115UC Bluetooth Marine Master Multiparameter Checker - Hanna Instruments
    On Sale 15%

    HI97115UC Bluetooth Marine Master Multiparameter Checker - Hanna Instruments

    Hanna Instruments

    $449.95
    $382.46
    One Meter to RULE THEM ALL! Marine Master Waterproof Wireless Multiparameter Photometer w/Bluetooth Connection to the Hanna App where you can save your results. pH (HI780) Alkalinity (HI772) Ammonia (HI784) Calcium (HI758) Magnesium...
  • On Sale 15%
    Digital Seawater Refractometer MA887 w/Protective Case - Milwaukee
    On Sale 15%

    Digital Seawater Refractometer MA887 w/Protective Case - Milwaukee

    Milwaukee Instruments

    $136.00
    $115.60
    This refractometer does come with a black or blue protective case. The new Milwaukee MA887 Seawater Digital Refractometer encompasses 3 different types of user selected scales for the measurement of seawater providing for a much more precise evaluation...
  • On Sale 15%
    35ppt (1.026sg) Refractometer Calibration Solution (1.25 oz) - Fritz
    On Sale 15%

    35ppt (1.026sg) Refractometer Calibration Solution (1.25 oz) - Fritz

    Fritz Aquatics

    $6.39
    $5.43
    Pre-measured refractometer calibration solution takes the guesswork out of properly calibrating your instrument - with no need for expensive or unreliable measuring equipment. A refractometer is essential to the saltwater hobbyist for success. Maintain...
  • Apex PM2 - Salinity, Temperature, I/O Expansion Module - Neptune Systems

    Apex PM2 - Salinity, Temperature, I/O Expansion Module - Neptune Systems

    Neptune Systems

    $94.99
    Maintaining consistent salinity in your aquarium is key to the well being of every organism inside it. And, as busy as we sometimes are, we don’t even realize our parameters are out of whack until it’s too late. With this module, your Apex...
  • Seawater Refractometer - Red Sea

    Seawater Refractometer - Red Sea

    Red Sea

    $74.99
    Main features of Red Sea’s Seawater Refractometer include:Directly reads the absolutesalinity ofseawaterat25°C/77 0F ( No need for seawater or temperature compensation factors)Specifically designed for the ionic content of seawater (NSW) for...
  • On Sale 15%
    Refractometer Calibration Standard (60 ml) - Brightwell
    On Sale 15%

    Refractometer Calibration Standard (60 ml) - Brightwell

    Brightwell Aquatics

    $5.04
    $4.28
    Refractometer & Hydrometer Calibration Standard 1.0264 Specific Gravity 1.3394 Refractive Index 35 ppt Salinity 53 uS/cm at 25 deg c Overview Brightwell Aquatics Aquarium Reagents Refractometer & Hydrometer Calibration Standard is...
  • On Sale 15%
    AccuraSea Refractometer Calibration Solution (250 ml) - Two Little Fishies
    On Sale 15%

    AccuraSea Refractometer Calibration Solution (250 ml) - Two Little Fishies

    Two Little Fishies

    $11.99
    $10.19
    Do you think it’s important to maintain salinity precisely? We’re with you. That’s why we created AccuraSea Seawater Reference Solution, the only calibration solution of its kind made from real seawater. It’s pure natural sea...
  • On Sale 15%
    ATC Seawater Refractometer - DD Aquarium Solutions
    On Sale 15%

    ATC Seawater Refractometer - DD Aquarium Solutions

    All Misc Brands

    $54.99
    $46.74
    Almost all, if not all, of the refractometers currently available to the aquarium hobby are designed for measuring saltwater (sodium chloride or brine solution) and not true ‘seawater’. Although seawater is mostly sodium chloride it also...
  • On Sale 15%
    HI981520 Hanna Marine Monitor pH, Marine Salinity, Temperature - Hanna Instruments
    On Sale 15%

    HI981520 Hanna Marine Monitor pH, Marine Salinity, Temperature - Hanna Instruments

    Hanna Instruments

    $275.00
    $233.75
    Monitoring the salinity, pH and temperature of the water is an important routine in the maintenance of a marine aquarium or marine aquaculture. The Hann HI981520 is an easy-to-use monitor that continuously monitors and displays salinity (via...
  • On Sale 15%
    Digital Refractometer for Seawater Analysis (HI96822) - Hanna Instruments
    On Sale 15%

    Digital Refractometer for Seawater Analysis (HI96822) - Hanna Instruments

    Hanna Instruments

    $231.00
    $196.35
    The HI96822 is a rugged, portable digital refractometer designed for the measurement of salinity of natural or artificial seawater. The HI96822 displays results in three popular measurement units: Practical Salinity Units (PSU), salinity in parts per...
  • On Sale 15%
    MC811US MAX pH/EC/Temp Monitor - Milwaukee
    On Sale 15%

    MC811US MAX pH/EC/Temp Monitor - Milwaukee

    Milwaukee Instruments

    $199.00
    $169.15
    Why Guard when you can Monitor! The Milwaukee MC811 MAX pH/EC/Temp Monitor lets you monitor your pH/EC/Temp levels 24/7 automatically. RANGE: 0.0 - 12.0 pH | 0.00 to 5.00 mS/cm | 14.0°F to 140.0°F RESOLUTION: 0.1 pH | 0.01 mS/cm |...
  • On Sale 15%
    PINPOINT® AC Adapter Kit 110 VAC - American Marine
    On Sale 15%

    PINPOINT® AC Adapter Kit 110 VAC - American Marine

    American Marine

    $11.95
    $10.16
    PINPOINT® AC Adapter Kit (available in 110 VAC of 220 VAC) is optional to replace the 9-volt battery, which some monitor owners find convenient when monitoring full time. This AC Kit now contains special electronic filtering to avoid electrical...
  • On Sale 15%
    FOWLR Deluxe Saltwater Test Set (HI98319, 781, Salifert PO4)
    On Sale 15%

    FOWLR Deluxe Saltwater Test Set (HI98319, 781, Salifert PO4)

    Salifert

    $129.99
    $110.49
    Hanna Salinity/Temperature Checker - HI98319 Salinity/Temperature Meter - Each meter is supplied with: CR2032 battery (inside the meter), Storage / Protection sleeve, Instruction manual, Quality certificate, and 35.00 ppt calibration standard sachet (4...
  • On Sale 15%
    Reef Tank Beginner Saltwater Test Set
    On Sale 15%

    Reef Tank Beginner Saltwater Test Set

    Salifert

    $119.99
    $101.99
    Generic Refractometer - It is designed for testing the concentration of salt water and brine and used for quality control in research and clinical laboratories and marine industry. Its scale provides a direct reading of the specific gravity and...
  • On Sale 15%
    FOWLR Beginner Saltwater Test Set (Refractometer, Salifert NO3, PO4)
    On Sale 15%

    FOWLR Beginner Saltwater Test Set (Refractometer, Salifert NO3, PO4)

    Salifert

    $65.99
    $56.09
    Generic Refractometer - It is designed for testing the concentration of salt water and brine and used for quality control in research and clinical laboratories and marine industry. Its scale provides a direct reading of the specific gravity and...