Hanna Saltwater Aquarium Alkalinity Colorimeter (dKH) – Checker® HC


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

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

The Hanna 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. The Hanna handheld colorimeter eliminates the hassle of matching to a color chart by providing a direct saltwater alkalinity result in dKH units.

  • Portable and fits right in your pocket.
  • Simple, one-button operation makes getting your alkalinity results easy.
  • Improve your testing routine and upgrade from your standard test kit


Range 0.0 to 20.0 dKH
Resolution 0.1 dKH
Accuracy @ 25°C/77°F ±0.3 dKH ±5% of reading
Light Source LED @ 610 nm
Light Detector silicon photocell
Method colorimetric method
Environment 0 to 50°C (32 to 122°F); RH max 95% non-condensing
Battery Type (1) 1.5V AAA
Auto-off after ten minutes of non-use
Dimensions 86.0 mm x 61.0 mm x 37.5 mm (3.4″ x 2.4″ x 1.5″)
Weight 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.
Warranty 1 year


Weight 2 lbs

Hanna Instruments


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