Hanna Instruments

Nitrite Ultra Low Range Colorimeter HI764 Hanna Checker - Marine Water

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Check for Nitrite easily in your tank. The Hanna HI764 Checker HC Handheld Colorimeter for Nitrite ULR bridges the gap between simple chemical test kits and professional instrumentation. Accurate, affordable and easy to use. First, zero the instrument with your water sample. Next, add the reagent. Last, place the vial into the Hanna Nitrite Checker, press the button and read the results. Done.



  • Easier to use and more accurate than chemical test kits
  • Large, easy to read digits Auto shut-off
  • Dedicated to a single parameter
  • Designed to work with HANNA's powder reagents
  • Uses 10 mL glass cuvettes
  • Small Size, Big Convenience
  • Fits in the palm of your hand



  • Range: 0 to 200 ppb
  • Resolution: 1 ppb
  • Accuracy: ±10 ppb ±4% of reading at 25°C
  • Light Source: LED @ 525 nm
  • Light Detector: Silicon photocell
  • Environment: 0 to 50°C (32 to 122°F); RH max 95% non-condensing
  • Battery Type: (1) 1.5V AAA
  • Auto-off: After 2 minutes of non-use
  • Dimensions: 81.5 x 61 x 37.5 mm (3.2 x 2.4 x 1.5")
  • Weight: 64 g (2.25 oz.)
  • Method: Adaptation of EPA Diazotization method 354.1


Replacement Reagents - HI764-25 Nitrate ULR Replacement Reagents


PDF IconHI764 Nitrite Ultra Low Range Colorimeter Manufacturer's Manual

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Product Questions

what should the number be for this unit for a safe level
mine says 13 is that safe
Thanks Rich
Question by: Richard on Apr 18, 2016, 3:24 AM
Great question!
The number should be below 30 PPB. This will be measured in PPB and at 13ppb the levels will well in range below the 30 which is the maximum amount in the tank
Answer by: Connor on Apr 25, 2016, 6:34 PM
Do you sell a Hanna checker for nitrate? Or is the nitrite ulr the same thing?
Question by: Larry Ross Smith on Jan 13, 2016, 2:19 PM
Great question!
We do not have a Hanna Checker for Nitrate unfortunately. The Nitrite will test a previous step in the nitrogen cycle process. Feel free to let us know if you have any further questions!
Answer by: Connor on Jan 13, 2016, 2:31 PM