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Water Testing

Aquarium Supplies

Water Test Kits

Using test kits to detect problematic water conditions is key to the sustainability of a healthy aquarium. For a fish-only tank, you should measure and monitor pH, alkalinity, ammonia, nitrite, and nitrate levels. In addition to these, you should also monitor the calcium, magnesium and strontium levels in a reef aquarium.

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  1. Captive Purity Refractometer (standard)

    Captive Purity Refractometer (standard)

    The Captive Purity Refractometer is an incredibly accurate and easy to use device that eliminates the confusion associated with inexpensive hydrometers. Just place a couple of drops of water on the prism and hold to the light. Rea...
    ONLY
    $59.99
  2. Captive Purity Refractometer with Light

    Captive Purity Refractometer with Light

    Be First to Review

    The Captive Purity Refractometer is an incredibly accurate and easy to use device that eliminates the confusion associated with inexpensive hydrometers. Just place a couple of drops of water on the prism and hold to the light. Rea...
    ON SALE
    $75.99
  3. Captive Purity Refractometer

    Captive Purity Refractometer

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    The Captive Purity Refractometer is an incredibly accurate and easy to use device that eliminates the confusion associated with inexpensive hydrometers. Just place a couple of drops of water on the prism and hold to the light. Rea...
    FROM ONLY
    $59.99
  4. Captive Purity Refractometer with Calibration Dial

    Captive Purity Refractometer with Calibration Dial

    Be First to Review

    The Captive Purity Refractometer is an incredibly accurate and easy to use device that eliminates the confusion associated with inexpensive hydrometers. Just place a couple of drops of water on the prism and hold to the light. Rea...
    ON SALE
    $69.99

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