Hanna Instruments

HI772 DKH Alkalinity Checker

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Get accurate results for your saltwater aquarium with Hanna's simple handheld colorimeter digital test kit.  The HI772 dKH Alkalinity Checker®HC is our most popular selling aquarium product. Our 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. Our handheld colorimeter eliminates the hassle of matching to a color chart by providing a direct saltwater alkalinity result in dKH units.

  • Remove the human error from your testing
  • No need to count drop or titrate your sample
  • Detects color changes your eye cannot
  • No calibration required
  • Get east, quick and consistent results
  • Accurate and affordable
  • Cost efficient: Once you purchase the Checker, reagents are sold separately saving money long term



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.

Features at-a-glance:

       Easier to use and more accurate than chemical test kits

       Most popular reef aquarium product

       About one minute to preform a test

       Comes with 25 tests

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.

Extra reagent can be found here

Customer Reviews

Based on 2 reviews Write a review

Customer Reviews

Based on 2 reviews

love this tester, I bought the Phos and Calcium as well but this one is by far the fastest to do.


it's easy, turn it on, 10ML talk water in, click a button, add 1ml of the reagent, click the button and bam you have your number. Takes less than a minute. This is a must have for reefers.