Hanna Checker® Handheld Colorimeter Marine Phosphate Ultra Low Range HC - HI774

Hanna Instuments


Marine Phosphate Ultra Low Range Checker® HC - HI774

The Hanna Phosphate Ultra Low Range (0.00 to 0.90 ppm) Checker® bridges the gap between simple chemical test kits and professional instrumentation. Chemical test kits have limited accuracy and resolution since they rely upon the human eye to discern differences in color.

Professional instrumentation incorporates a light source such as an LED or tungsten lamp with a filter and a light-sensing detector to precisely determine ion concentration. Professional instrumentation offers greater resolution and accuracy but can cost hundreds of dollars.

The Hanna Phosphate Ultra Low Range Checker® uses a fixed wavelength LED and silicon photo detector to provide the accuracy of professional instrumentation at the affordable price of a chemical test kit.


  • Phosphate Range 0.00 to 0.90 ppm
  • Phosphate Resolution 0.01 ppm
  • Phosphate Accuracy +/- 0.02 ppm +/- 5% of reading
  • Phosphate Method adaptation of the Standard Methods for the Examination of Water and Wastewater, 20th edition, Ascorbic-Acid method. The reaction between phosphate and the reagent causes a blue tint in the sample.
  • Photometer/Colorimeter Light Source LED @ 525 nm
  • Photometer/Colorimeter Light Detector silicon photocell
  • Battery Type/Life (1) 1.5V AAA
  • Automatic Shut-Off after seven minutes of non-use and two minutes after taking a reading
  • Environment 0 to 50°C (32 to 122°F); RH max 95% non-condensing
  • Weight 64 g (2.25 oz.)
  • Dimensions 86.0mm x 61mm x 37.5mm (3.4" x 2.4" x 1.5”)
  • Ordering Information HI774 Checker® is supplied with (2) sample cuvettes with caps, phosphate ULR reagent for 10 tests, battery, instructions and quick start guide.