Hanna Instruments

Nitrate High Range Colorimeter HI782 - Marine Water

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The HI782 Nitrate Checker HC by Hanna Instruments is a simple and accurate handheld colorimeter that uses the zinc reduction method to determine nitrate concentration in marine applications. With a digital read out, there is no more struggling to determine colors visually. The HI782`s high range of 0.0 - 75.0 ppm makes it ideal for measuring high nitrate levels found in saltwater aquariums.



  • Designed to accurately determine nitrate levels in aquariums and marine biology applications
  • Only requires 1 reagent for simplicity
  • No filter process
  • Measures with a range up to 75.0ppm
  • Easier to use and more accurate than chemical test kits
  • Dedicated to a single parameter
  • Simple one-button operation
  • Large LCD digital read out for added convenience
  • Auto shut-off to assure the battery wont be drained
  • Compact size for easy travel and storage


The HI782 Checker is a simple, accurate, and cost-effective way to measure nitrate in your saltwater aquarium.

Nitrate is a by-product of the Nitrogen cycle. Excessive amounts of nitrates in a reef and fish only aquariums can promote the growth of undesirable organisms including algae and dinoflagellates which can quickly choke out filtration, lighting, and sessile organisms.



  • Range: 0.0 to 75.0 ppm (as NO3-)
  • Resolution: 0.1 ppm
  • Precision: ±2 ppm ±5% of reading @ 77°F (25°C)
  • Light Source: LED @ 525 nm
  • Light Detector: Silicon photocell
  • Environment: 0 to 50°C (32 to 122°F); max 95% RH non-condensing
  • Battery Type: (1) 1.5V AAA
  • Auto-off: After 10 minutes of non-use
  • Dimensions: 86 x 61 x 37.5 mm (3.4 x 2.4 x 1.5")
  • Weight: 64 g (2.3 oz.)
  • Method:Zinc reduction method. The reaction between nitrate and the reagent causes a pink tint in the sample.
  • Interferences: Nitrite


What’s Included?

  • (1x) HI782 Checker HC 
  • (1x) Sample cuvette and (2x) caps
  • (1x) Marine Nitrate High Range Starter Kit (reagents for 10 tests)
  • (1x) 3mL Pasteur pipette
  • (1x) 1.5V AAA Alkaline battery
  • (1x) Instruction manual
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Product Questions

Will you be carrying the Hanna HI782-11 Marine HIGH Range Nitrate Checker Calibration Check Set?
Question by: Douglas Weaver on May 17, 2022, 7:13 PM
Hey Douglas, thanks for the question. At this time we do not but it is very possible that we do in the future should our marketing team decide to onboard it.
Answer by: James Johnson (BRS Staff) on May 19, 2022, 10:01 AM
Can this be used with freshwater tank?
Question by: Leo Anderson on Dec 9, 2021, 8:35 PM
Thank you for reaching out with your question. The Hanna Nitrate high range checker is designed for marine water and will not give accurate results in a fresh water system. Hanna does not currently make a fresh water nitrate checker
Answer by: William Glenn (BRS Staff) on Dec 15, 2021, 1:48 PM
Can this be used with freshwater tanks?
Question by: Leo Anderson on Dec 8, 2021, 2:50 PM
Thank you for reaching out with your question. The Hanna Nitrate High Range Colorimeter HI782 is for Marine water and would not be suitable for freshwater. Hanna does not make a checker for freshwater nitrate
Answer by: William Glenn (BRS Staff) on Dec 15, 2021, 11:48 AM