Saltwater Nitrate High Range Checker® HC - HI782

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The HI782 Marine Nitrate High Range Colorimeter is specifically designed to quickly and accurately determine high levels of nitrate for saltwater aquariums and marine applications. With a digital read out, there is no more struggling to determine colors visually. 

  • Measurements with a range up to 75.0 ppm
  • Less complex laboratory grade accuracy = Requires only 1 reagent
  • Simple, intuitive digital operation
  • Compact and precise whether at home, at work, or on-the-go

Nitrate is the final step in the Nitrogen cycle. Excessive amounts of nitrates in saltwater aquariums facilitate the growth of undesirable organisms such as algae and dinoflagellates.


The HI-782 Nitrate Checker HC uses the Zinc Reduction method, a no filter process, to measure the concentration of nitrate colorimetrically, ultimately reducing the time of each test and leaving no additional waste.


With higher range measurements, such as the HI-782 which ranges from 0.0 up to 75.0 ppm (as NO3), there is also no dilution procedure needed.


Features at-a-glance:


  • For use with saltwater samples.
  • More accurate than chemical test kits.
  • Dedicated to a single parameter.
  • Small size, big convenience.
  • No errors with a digital readout.
  • Ideal for aquariums and marine biology applications.



Specifications HI782
Range 0.0 to 75.0 ppm (mg/L) NO₃-
Resolution 0.1 ppm
Accuracy @ 25°C/77°F ±2.0 ppm ±5% of reading 
Light Source LED @ 525 nm
Light Detector silicon photocell
Method Zinc reduction method. The reaction between nitrate and the reagent causes a pink tint in the sample. This checker has been developed to work with seawater samples.
Auto-off after ten minutes of non-use
Environment 0 to 50°C (32 to 122°F); RH max 95% non-condensing
Battery Type (1) 1.5V AAA
Ordering Information HI782 Checker HC is supplied with sample cuvettes with caps (2), Marine Nitrate High Range reagent starter kit (reagents for 10 tests), 3 mL Pasteur pipette (1 pc.), 1.5V AAA alkaline battery (1 pc), and instruction manual.
Accessories HI782-25 Reagent set for 25 tests; HI781-11 Certified standard kit
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