Hanna HI772 Marine Alkalinity (dKH) Checker

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Marine Alkalinity (dKH) Checker by Hanna

Get accurate results for your saltwater aquarium with this simple handheld colorimeter.

The alkalinity colorimeter bridges the gap between alkalinity test kits and advanced instrumentation. Standard test kits have limited accuracy since they rely upon the human eye to match colors. This handheld colorimeter eliminates the hassle of matching to a color chart by providing a direct saltwater alkalinity result in dKH units.

  • The handheld colorimeter is portable and fits right in your pocket. 
  • Simple, one-button operation makes getting alkalinity results easy. 
  • Improve your testing routine and upgrade from a standard test kit


The HI772 Checker®HC (Handheld Colorimeter) provides a simple, accurate, and cost-effective way to measure alkalinity in degrees of carbonate hardness, commonly abbreviated as dKH. Critical to marine environments, alkalinity not only provides the carbonate ion required for calcium carbonate skeletal regeneration of coral reefs, but it also acts as a pH buffer against large changes in acidity. Designed as a more accurate alternative to chemical test kits, the HI772 provides quick, accurate results in a few easy steps.


Easier to use and more accurate than chemical test kits

  • Dedicated to a single parameter
  • Small size, big convenience
  • Ideal for: Aquaculture & Aquariums, Water Quality



0.0 to 20.0 dKH


0.1 dKH

Accuracy @ 25°C/77°F

±0.3 dKH ±5% of reading

Light Source

LED @ 610 nm

Light Detector

silicon photocell


colorimetric method


0 to 50°C (32 to 122°F); RH max 95% non-condensing

Battery Type

(1) 1.5V AAA


after ten minutes of non-use


86.0 mm x 61.0 mm x 37.5 mm (3.4" x 2.4" x 1.5")


64 g (2.25 oz.)

Ordering Information

HI772 Checker® is supplied with (2) sample cuvettes with caps, alkalinity reagent starter kit for 25 tests (1 bottle of alkalinity reagent), (1) 1 ml syringe and tip, ­­­ battery, instructions, and quick start guide.


1 year limited warranty