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  1. API 5 in 1 Aquarium Test Strips

    The quick and accurate way to test for pH, Nitrite, Nitrate, General Hardness and Carbonate Hardness. Desiccant-lined tube, with snap-tight cap, provides maximum moisture protection for accurate results. Learn More

    Special Price: $14.68

    Regular Price: $18.90

  2. API Ammonia Aquarium Test Strips

    The quick and accurate way to test for the presence of ammonia. This kit reads 0-6 ppm of ammonia. Desiccant-lined tube, with snap-tight cap, provides maximum moisture protection for accurate results. Learn More

    Special Price: $15.33

    Regular Price: $17.12

  3. API Ammonia Test Kit

    Ammonia Test Kit (130 Tests) Fresh & Salt Water Learn More

    Special Price: $11.54

    Regular Price: $13.64

  4. API Calcium Test Kit

    Calcium is one of the most important elements in a reef aquarium. Reef invertebrates such as corals, crustaceans, mollusks and even some types of encrusting algae need calcium to grow and remain healthy. Learn More

    Special Price: $11.03

    Regular Price: $15.00

  5. API Carbonate Hardness Test Kit

    Tests tap water & fresh aquariums for carbonate hardness (KH). Can be used to determine the proper dose of pH buffers. Learn More

  6. API Copper Test Kit

    Copper, a common treatment for many parasitic infections, must be monitored in an aquarium or a pond. Learn More

  7. API Freshwater Master Test Kit

    This kit tests tap water and aquarium water for five different parameters that affect the health of freshwater fish: pH, High Range pH, Ammonia, Nitrite and Nitrate. Learn More

    Special Price: $33.40

    Regular Price: $46.20

  8. API GH & KH Test Kit

    Tests tap water and freshwater aquariums for general hardness (GH) and carbonate hardness (KH). Helps detect stress on fish caused by rapid pH shifts, which result from low KH levels and helps aquarists duplicate the natural habitat of their fish. Learn More

    Special Price: $9.35

    Regular Price: $14.44

  9. API High Range PH Test Kit

    Fresh Water & Salt Water test kit. pH7.4 to 8.8 Learn More

    Special Price: $6.51

    Regular Price: $8.40

  10. API KH Test Kit

    KH Test Kit Learn More

    Special Price: $6.56

    Regular Price: $11.29

  11. API Nitrite Test Kit

    Toxic nitrite is produced by nitrifying bacteria in the biological filter as it breaks down ammonia. This kit tests for harmful nitrite and measures levels from 0 to 5.0 ppm. Learn More

    Special Price: $8.24

    Regular Price: $10.49

  12. API pH Aquarium Test Strips

    The quick and accurate way to test pH. Tests a wide range: 6.0 – 9.0. Desiccant-lined tube, with snap-tight cap, provides maximum moisture protection for accurate results. Learn More

    Special Price: $11.03

    Regular Price: $14.70

  13. API pH Test & Adjuster Kit

    A complete kit to measure and adjust pH. Tests pH levels from 6.0 to 7.6 and includes bottles of pH Up and pH Down to modify aquarium water pH to desired levels. Learn More

  14. API pH Test Kit

    API fresh water pH test kit pH6 to 7.6, Learn More

    Special Price: $6.29

    Regular Price: $7.56

  15. API Phosphate Test Kit

    Phosphate Test Kit Water Testing Phosphate can enter your aquarium through tap water, fish waste, and decaying organics such as uneaten food and dead algae. Excess phosphate contributes to unsightly algae blooms. This kit tests phosphate levels from 0 to 10 ppm in fresh and saltwater aquariums. Learn More

    Special Price: $13.28

    Regular Price: $16.70

  16. API PondCare® Master Test Kit

    PondCare® Master Test Kit is a complete kit for testing tap water & pond water. Tests water 4 different ways to protect pond fish from dangerous water conditions. Tests include: pH, ammonia, nitrite, and phosphate. Kit contains instruction book, improved color cards for easier reading, 4 test tubes and holding tray. Learn More

  17. API Reef Master Test Kit

    To maintain and grow healthy corals, the correct balance of calcium and carbonates is essential, as are low levels of phosphate and nitrate. This kit provides highly accurate testing for each of these critical parameters: calcium, KH, phosphate and nitrate. Unique, transparent dome allows clear view of contents. Kit includes computer-calibrated and laminated color cards, 4 glass test tubes and holding tray. Also contains complete, step-by-step instruction booklet, including information on how to correct unsafe water conditions. Compact to store. Learn More

    Special Price: $33.60

    Regular Price: $41.06

  18. API Replacement Test Tube With Cap x1

    API Replacement Test Tube With Cap x 1. A really useful test tube to replace broken test tubes. Ideal for carrying out all your aquarium chemical reactions. Come complete with cap. Learn More

  19. API Replacement Test Tubes With Caps x 24

    A really useful set of original replacement test tubes for carrying out all your aquarium chemical reactions. Come complete with capsand for use in API water testing kits where the original tube is needing replacing. Learn More

  20. API Saltwater Master Test Kit

    A complete kit for testing marine aquarium water. Tests water four ways to protect marine fish and invertebrates from dangerous water conditions. Learn More

    Special Price: $26.99

    Regular Price: $44.10

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