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Hanna Alkalinity (dKH) Checker

Hanna Alkalinity (dKH) Checker


Alkalinity Colorimeter that makes checking your tanks parameters easy - already converted!

Hanna Instruments

Availability: In stock

$ 69.95

Product Questions

Do you stock reagent for this checker
Product Description


    The Hanna Marine Alkalinity (dKH) 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. This level of instrumentation also offers greater resolution and accuracy, but can cost hundreds of dollars.

    The Hanna Marine Alkalinity 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.


    • Compact and Portable Design.
    • Built-In Timer
    • One Button Operation
    • Easier to use and more accurate than chemical test kits
    • Dedicated to a single parameter
    • Ideal for: Water Quality, Environmental, Education, Industrial

    • Range: 0 - 20 dKH
    • Resolution: 0.1 dKH
    • Accuracy: +/- 0.3dKH, +/- 5% of reading (based on water temperature of 25c or 77f)
    • Light Source: LED @ 610nm
    • Light Detector: Silicon Photocell
    • Method: Colorimetric Method
    • Operating Environment: 0-50 degrees Celsius, RH max 95% non-condensing
    • Battery Type: 1 - 1.5v AA
    • Auto-Shutoff: Automatically shuts off after 10 minutes of non-use.
    • Dimensions: 81.5mm x 61mm x 37.5mm (3.2" x 2.4" x 1.5")
    • Weight: 64 grams (2.25oz)
    • Warranty: 6 month manufacturer limited warranty

    Hanna HI-772 Alkalinity (dKH) Checker User Manual
Additional Information

    Additional Information

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    1. Accurate tester Review by Kevin

      I was having difficulty getting consistent results from API tests so I got this. The price was an bit much but this hobby is anything but cheap. I found the device very accurate and easy to use allowing for precise measurement of my Alk which helped monitor the tank for growing SPS. I would highly recommend this checker as it has helped me fend off RTN which will happen to SPS if your Alk gets too low. (Posted on 10/29/2018)

    2. Easy to use Review by DKokoMan

      I received my Hanna Alkalinity Checker and right out of the box it met my expectations. A compact electronic tester to take the guesswork out of different colour hues was exactly what I wanted. I also order an additional reagent which is a good value once you have the original checker.

      Unfortunately my checker had an issue surrounding a bad battery error. I contacted J&L Aquatics who immediately followed up and provided me a contact for the Hanna Canada. After speaking to Hanna Canada the wonderful folks at J&L Aquatics were in constant communication and made sure I got a new checker within the week. A+ service by J&L Aquatics and someone who actually stands by warranty of a product. (Posted on 5/20/2017)

    3. Nice product Review by Ryan

      Makes testing quick, easy, and accurate. (Posted on 1/7/2017)

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