Hanna Instruments

Phosphate Ultra Low Range PPM Colorimeter HI774 Hanna Checker - Marine Water

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The HI774 Ultra Low Range Phosphate Checker® is a cost-effective way to measure phosphate in marine systems, including reef tanks. Excessive phosphate levels can prevent calcification, skeletal formation, and growth of many coral species, particularly those referred to as SPS or small-polyp stony. In addition, high phosphate levels can cause nuisance algae growth in your reef tank. This can become problematic because algae often outcompetes sessile organisms for light, nutrients, and space, jeopardizing long term coral health in your reef.Testing for phosphates is standard practice for saltwater aquariums and provides valuable insight into your reef tank’s water chemistry to help ensure long-term coral health.


The HI774 Phosphate ULR checker provides an accurate way to measure phosphate from 0.00 to 0.90 ppm in a few easy steps.



  • 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 reagents
  • Uses 10 mL glass cuvettes
  • Small Size, Big Convenience
  • Fits in the palm of your hand



  • Range: 0.00 to 0.90 ppm
  • Resolution: 0.01 ppm
  • Accuracy: ±.02 ppm ±5% of reading
  • Light Source: LED @ 525 nm
  • Light Detector: Silicon photocell
  • Method: Adaptation of Standard Method for Examination of Water and Wastewater, 20th edition, Ascorbic Acid method
  • Environment: 0 to 50°C (32 to 122°F); RH max 95% non-condensing
  • Battery Type: (1) 1.5V AAA
  • Auto-off: After 7 minutes of non-use and 2 minutes after reading
  • Dimensions: 86 x 61 x 37.5 mm (3.4 x 2.4 x 1.5")
  • Weight: 64 g (2.25 oz.)
  • Uses Hanna HI774-25 reagent refills


What's Included

  • HI774 Checker
  • 2 sample cuvettes with caps
  • ULR Reagent for 10 tests
  • battery
  • instructions
  • quick start guide
  • 1 year limited warranty


Reagent Refills - Hanna HI774-25

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Product Questions

Does this come with reagent? Thanks!
Question by: Chris Reed on Jun 16, 2022, 9:38 AM
Answer by: Scott F. (BRS Staff) on Jun 16, 2022, 12:55 PM
Is the new Hanna phosphate ULR HI774 colorimeter more accurate than the older HI 713 one?
Question by: Karl on Jan 2, 2019, 2:21 AM
Thanks for contacting BRS!
This checker is going to be more accurate than the HI713, but it is the same accuracy and resolution of the HI736 except that it calculates the result into phosphate so you do not have to. Have a great day!
Answer by: Noah on Jan 4, 2019, 3:05 PM