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Marine Alkalinity (CaCO3) Checker® HC

51.00  + PVM

The HI755 Checker®HC to measure alkalinity.  Range  0 – 300 mg/l CaCO3.

SKU: HI755 Category:

Available on backorder

The Hanna Marine Alkalinity 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 absorbance and ion concentration. Professional instrumentation offers greater resolution and accuracy but can cost hundreds of dollars. The Hanna Marine Alkalinity Checker® measures alkalinity in parts per million (ppm) of calcium carbonate (CaCO3) ,using a fixed wavelength LED and silicon photo detector to provide the accuracy of professional instrumentation at the affordable price of a chemical test kit.

Compact, Portable Design

Built-in Timer

One-Button Operation


The HI755 Checker®HC (Handheld Colorimeter) provides a simple, accurate and cost-effective way to measure alkalinity.  Crucial in marine environments, alkalinity provides both the carbonate ion required for calcium carbonate skeletal regeneration of coral reefs, as well as a pH buffer against large changes in acidity.  Designed as a more accurate alternative to chemical test kits, the HI755 provides quick, accurate results in four easy steps:

Features at-a-glance:

  • Easier to use and more accurate than chemical test kits
  • Dedicated to a single parameter
  • Small size, big convenience
  • Ideal for: Water Quality, Environmental, Education, Industrial

Instructional Video

Seawater Alkalinity Range 0 to 300 ppm
Seawater Alkalinity Resolution 1 ppm
Seawater Alkalinity Accuracy ±5 ppm (mg/L) ±5% of reading
Seawater Alkalinity Method colorimetric method.
Photometer/Colorimeter Light Source LED @ 610 nm
Photometer/Colorimeter Light Detector silicon photocell
Battery Type/Life (1) 1.5V AAA
Automatic Shut-Off after ten minutes of non-use
Environment 0 to 50°C (32 to 122°F); RH max 95% non-condensing
Weight 64 g (2.25 oz.)
Dimensions 81.5mm x 61mm x 37.5mm (3.2″ x 2.4″ x 1.5”)
Ordering Information HI755 Checker® is supplied with (2) sample cuvettes with caps, alkalinity reagent starter kit for 25 tests (1 bottle of alkalinity reagent), ­­­(1) battery, instructions and quick start guide.

Additional information

Weight 0.345 kg

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