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  • Phosphate Pro Test Kit (PO4) - 100 Tests - Red Sea

    Phosphate Pro Test Kit (PO4) - 100 Tests - Red Sea

    Red Sea

    $54.99
    Red Sea’s Phosphate Pro Test Kit is an advanced colorimetric test with comparator, measuring the level of phosphate in your reef aquarium to an exceptionally high accuracy of 0.02ppm PO4. Phosphate Pro Test Kit, when used in conjunction with...
  • Phosphate Marine Test Kit - Red Sea

    Phosphate Marine Test Kit - Red Sea

    Red Sea

    $28.99
    Phosphate Test Kit Accurate measurement of Phosphate in marine aquariums PO4 Red Sea’s colorimetric Phosphate test kit provides a quick and reliable measurement of Phosphate in your aquarium to an accuracy of 0.1ppm PO4. This test kit, in...
  • On Sale 25%
    (OVERSTOCK) (Expires 11/2025) (HI781-25) Marine Low Range Nitrate Checker Reagents (25 Tests) - Hanna Instruments
    On Sale 25%

    (OVERSTOCK) (Expires 11/2025) (HI781-25) Marine Low Range Nitrate Checker Reagents (25 Tests) - Hanna Instruments

    Hanna Instruments

    $16.00
    $11.99
    The HI781-25 are high-quality reagents that are pre-measured, allowing for users to achieve fast and accurate measurements with their HI781 Marine Nitrate Low Range Colorimeter. These reagents follow a colorimetric method in which the reaction between...
  • Graduated Pipette - 100 µL (HI731339P) - Hanna Instruments

    Graduated Pipette - 100 µL (HI731339P) - Hanna Instruments

    Hanna Instruments

    $22.00
    The HI731339P is a volumetric pipette designed to measure and transfer exactly 100 µL of solution to a cuvette. To obtain the highest accuracy and precision from the HI758 marine calcium Checker it is necessary to add exactly 100 µL of...
  • MW600 Dissolved Oxygen Meter - Milwaukee Instruments

    MW600 Dissolved Oxygen Meter - Milwaukee Instruments

    Milwaukee Instruments

    $208.00
    Milwaukee MW600 LED Economy Portable Dissolved Oxygen Meter with 2 Point Manual Calibration, 0.0 - 19.0 mg/L, 0.1 mg/L Resolution, +/-1.5 percent Accuracy, 100 Percent Saturation Range The Milwaukee MW600 is a portable dissolved oxygen (DO) meter for...
  • Oxygen (O2) Ultra Test Kit - Salifert

    Oxygen (O2) Ultra Test Kit - Salifert

    Salifert

    $19.99
    Salifert Oxygen Profi-Test Corals and marine fish require very high levels of oxygen concentration because of the low solubility of oxygen in salt water so it is very important to regularly test the level of oxygen present. The Salifert Oxygen Profi-Test...
  • HI721 Iron Checker - Hanna Instruments

    HI721 Iron Checker - Hanna Instruments

    Hanna Instruments

    $63.95
    The Hanna Iron Checker bridges the gap between simple chemical test kits and professional instrumentation. Chemical test kits have limited accuracy and resolution since they rely upon the human eye to discern differences in color. Professional...
  • ATC Seawater Refractometer - DD Aquarium Solutions

    ATC Seawater Refractometer - DD Aquarium Solutions

    All Misc Brands

    $54.99
    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...
  • High Range pH Test Kit (160 Tests) - API

    High Range pH Test Kit (160 Tests) - API

    API

    $9.48
    High Range pH Test Kit The API® High Range pH Test Kit measures pH changes in marine aquariums, aquariums with African Cichlids, and very alkaline tap water. The API® High Range pH Test Kit reads the pH of water within the high range of 7.4...
  • Reef Buffer (250g) - Seachem

    Reef Buffer (250g) - Seachem

    Seachem

    $7.47
    Reef Buffer™ will also raise carbonate alkalinity; however, it is intended primarily for use as a buffer in a reef system where the maintenance of a pH of 8.3 is often difficult. When pH is not an issue, Reef Builder™ or Reef Carbonate™...
  • HI70031P 1413 20 ml (Single Pack) - Hanna Instruments

    HI70031P 1413 20 ml (Single Pack) - Hanna Instruments

    Hanna Instruments

    $1.49
    Technical SpecificationsMfr #: HI70031PItem: Calibration Solution    Container: 20mLType: Electric ConductivityRange: 1413 uS/cm    Container: 20mLProduct DescriptionCalibration PacketConcentration 1413 Microsiemens Per...
  • Marine (pH) Test Kit - Elos

    Marine (pH) Test Kit - Elos

    ELOS

    $16.50
    The pH-value or acid value indicates how acidic or alkaline water is. It is a measure of the concentration of the acidic or alkaline components in a hydrous solution. Pure water will react neutral and has a pH-value of 7. If the acidic components are...
  • PINPOINT pH Monitor - American Marine

    PINPOINT pH Monitor - American Marine

    American Marine

    $89.99
    The PINPOINT® pH Monitoris in use by thousands of customers worldwide. This affordable unit remains the only full-time pH monitor with .01 resolution. The PINPOINT® pH Monitor is sold complete with probe and calibration fluids (9 volt battery not...
  • MW500 Standard Portable ORP Meter - Milwaukee Instruments

    MW500 Standard Portable ORP Meter - Milwaukee Instruments

    Milwaukee Instruments

    $109.00
    Standard portable meters with no frills! Milwaukee’s low cost durable meters for quick and reliable measurements. Milwaukee’s Standard meters are manufactured to be easy to use, practical and accurate. Ideal for the classroom, laboratory...
  • HI70031P 1413 20 ml (25 Pack) - Hanna Instruments

    HI70031P 1413 20 ml (25 Pack) - Hanna Instruments

    Hanna Instruments

    $29.00
    Technical SpecificationsMfr #: HI70031PItem: Calibration Solution    Container: 20mLType: Electric ConductivityRange: 1413 uS/cm    Container: 20mLProduct DescriptionCalibration PacketConcentration 1413 Microsiemens Per...
  • PhosBond (250 mL) - Seachem

    PhosBond (250 mL) - Seachem

    Seachem

    $11.50
    PhosBond™ is a revolutionary new product that combines the phosphate removing capabilities of both aluminum oxide and granular ferric oxide into a singular material forming a synergistic effect. It rapidly removes phosphates and silicates from...
  • Copper Test Kit (90 Tests) - API

    Copper Test Kit (90 Tests) - API

    API

    $12.48
    Copper Test Kit Copper – a treatment for many parasitic infections – must be monitored in an aquarium or a pond. The copper level can drop too low for the treatment to be effective, or can increase to a point that is detrimental to fish...
  • Magnesium (Mg) Test Kit - Elos

    Magnesium (Mg) Test Kit - Elos

    ELOS

    $25.99
    Mg Magnesium Water Analysis for AquariumMagnesium is a major salt in natural seawater. Contrary to its significance this element was ignored for a long time. We know today that Magnesium creates a remarkable improvement in the growth of calcareous algae...
  • Reef Carbonate (500 mL) - Seachem

    Reef Carbonate (500 mL) - Seachem

    Seachem

    $7.59
    Reef Carbonate™ is a concentrated (4,000 meq/L) optimized blend of carbonate and bicarbonate salts designed to restore and maintain alkalinity in the reef aquarium. Calcium and carbonates are essential to all coral growth. If either becomes...
  • MultiTest Copper (75 tests) Marine & Freshwater - Seachem

    MultiTest Copper (75 tests) Marine & Freshwater - Seachem

    Seachem

    $16.31
    This kit measures copper (all types) to less than 0.01 mg/L in marine or freshwater. Uses a highly sensitive catalysis based procedure. MultiTest® Copper performs over 75 tests and contains a reference sample for validation.
  • pH 4.01 Calibration Buffer 20 ml (Pack of 25) - Hanna Instruments

    pH 4.01 Calibration Buffer 20 ml (Pack of 25) - Hanna Instruments

    Hanna Instruments

    $29.00
    HI70004P is a premium quality pH 4.01 calibration buffer solution. Each sachet has the lot number and expiration date stamped on it and is made of light block foil ensuring freshness each time one is opened. Hanna’s line of calibration buffers have...
  • Calcium (Ca) Test Kit - Elos

    Calcium (Ca) Test Kit - Elos

    ELOS

    $27.99
    Lab Quality Calcium (Ca) Water Analysis for the Marine Hobbyist Calcium is the primary building block for corals, calms, calcareous algae and many other marine organisms that we grow in our aquarium. Accuracy and consistency is crucial to guarantee that...
  • Phosphate (PO4) Reefer Test Kit 50 Tests - NYOS Aquatics

    Phosphate (PO4) Reefer Test Kit 50 Tests - NYOS Aquatics

    NYOS

    $24.99
    PHOSPHATE REEFER NYOS® REEFER test kits - taking measurements at the laboratory level at an attractive price Water properties as close to nature are the key for every aquarium's success. However, monitoring relevant parameters in seawater is...
  • pH/Alkalinity Marine Test Kit - Red Sea

    pH/Alkalinity Marine Test Kit - Red Sea

    Red Sea

    $23.99
    Easily and accurately test the pH and Alkalinity in your saltwater aquarium with the Red Sea pH/Alkalinity Test Kit. Maintaining proper alkalinity and pH in your reef tank is key to a successful reef tank.   Each kit includes: 100 pH...
  • pH 10.01 Calibration Buffer 20 ml (Pack of 25) - Hanna Instruments

    pH 10.01 Calibration Buffer 20 ml (Pack of 25) - Hanna Instruments

    Hanna Instruments

    $29.00
    HI70010P is a premium quality pH 10.01 calibration buffer solution. Each sachet has the lot number and expiration date stamped on it and is made of light block foil ensuring freshness each time one is opened. Hanna’s line of calibration buffers...
  • HI50021P Calibration Check Solution 20 mL (Single Pack) - Hanna Instruments

    HI50021P Calibration Check Solution 20 mL (Single Pack) - Hanna Instruments

    Hanna Instruments

    $1.56
    ONE Single 20 mL pack HI50021P is a premium quality calibration check solution used exclusively for the HI9813-6 portable pH/EC/TDS/Temp. meter. Each sachet has the lot number and expiration date stamped on it and is made of light block foil ensuring...
  • PINPOINT ORP Monitor Complete Package - American Marine

    PINPOINT ORP Monitor Complete Package - American Marine

    American Marine

    $134.99
    Package includes additional 9-volt to AC Adapter Kit, 3x Additional ORP/REDOX Calibration Fluids  PINPOINT® ORP Monitor will measure the ORP (oxidation-reduction potential, or REDOX) of your system. It is popular with those who use ozone gas or...
  • HI775 Marine Alkalinity Checker HC (Freshwater) - Hanna Instruments

    HI775 Marine Alkalinity Checker HC (Freshwater) - Hanna Instruments

    Hanna Instruments

    $63.95
    The Hanna Freshwater Alkalinity Checker bridges the gap between simple chemical test kits and professional instrumentation. Chemical test kits have limited accuracy and resolution since they rely upon the human eye to discern differences in color...