Alkalinity DKH Colorimeter HI772 Hanna Checker - Marine Water

Alkalinity DKH Colorimeter HI772 Hanna Checker
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  • Alkalinity DKH Colorimeter HI772 Hanna Checker
  • Alkalinity DKH Colorimeter HI772 Hanna Checker
  • Alkalinity DKH Colorimeter HI772 Hanna Checker

Alkalinity DKH Colorimeter HI772 Hanna Checker - Marine Water

88% Recommend this to a friend (21 of 24)

SKU: 210018
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Quick Overview

Why does BRS recommend this?

The Hanna Alkalinity checker is an awesome little tool that now will give results in DKH values that are much more common in the aquarium hobby. It will also give you accurate easy to read results with the large LCD display. We like the repeatable results and ability to purchase replacement reagents when needed. The biggest key with Hanna checkers is keeping the vials nice and clean for consistent results.

Uses Hanna HI755-26 liquid reagents

Three simple steps to results. The Hanna Alkalinity Checker bridges the gap between simple chemical test kits and professional instrumentation. Accurate, affordable and easy to use. First, zero the instrument with your water sample. Next, add the reagent. Last, place the vial into the Hanna Alkalinity Checker, press the button and read the results. Done.


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Product Questions

The spec says that the accuracy is +/-0.3 and +/- 5% of reading. So a reading of 10.0 could really be anywhere from 9.2 to 10.8. That's huge. Is that the spread of errors over many checkers and I could be lucky and get a good one, or is that the spread of measurement errors for any particular checker?
Question by: Boz on Apr 28, 2016 8:41:00 AM
Great question!
The dKH checker by Hanna is one if the easiest to use and just as accurate as all current hobby grade test kits for dKH currently available. Feel free to let us know if you have any further questions!
Answer by: Connor (Admin) on Apr 28, 2016 1:28:00 PM
Hanna list a calibration kit specifically for the HI772. Do you carry this or will the one for the HI775 work?
Question by: Deborah Yanko on Jul 1, 2016 10:54:00 PM
You can use the kit from the 775, the 772 checker is pretty much identical, but gives a readout of dKh instead of PPM.
Answer by: Valerie (Admin) on Jul 6, 2016 12:10:00 PM
How many tests will the included reagent perform.
Question by: Kaietan on Nov 18, 2016 1:57:00 PM
Hey There,
This checker includes 25 tests. If you have any other questions, let us know!
Answer by: Jason Smith (Admin) on Nov 18, 2016 2:26:00 PM
Will they provide a new reagent for this new HI772 Alk Checker (dKH) or does the previous HI755-26 reagent work?
Question by: Bosco Yung on Mar 24, 2016 6:27:00 PM
Great question!
This checker will use the same reagent as the HI755-26. Feel free to let us know if you have any further questions!
Answer by: Connor (Admin) on Mar 25, 2016 9:08:00 AM

Full Details

HI772 Owners Manual.pdf

Easier to use and more accurate than chemical test kits

Chemical and titration test kits have limited accuracy and very hard to repeat that usually will rely on the human eye and lighting to determine the reading. Hanna's HI772 Alkalinity Checker is much more reliable with their single light source with a fixed wavelength that will give the electronic checker the ability to make repeatable measurements time after time. Similar measurement devices are used by labs and large scale testing facilities for their dependable and precise measurements.

Dedicated to a single parameter

Designed to work with HANNA's liquid reagents. Uses 10 mL glass cuvettes.

Small Size, Big Convenience

Weighing a mere 65 g (2.3 oz.), the Checker®HC easily fits into the palm of your hand or pocket.Use for quick and accurate on the spot analysis. Single button operation: Zero and Measure Operated by a single AAA battery.


  • Range: 0.0 to 20.0 dKH
  • Resolution: 0.1 dKH
  • Precision: ±0.3 dKH ±5% of reading
  • Light Source: LED @ 610 nm
  • Light Detector: Silicon photocell
  • Environment: 0 to 50°C (32 to 122°F); RH max 95% non-condensing
  • Battery Type: (1) 1.5V AAA
  • Auto-off: After 10 minutes of non-use and after read
  • Dimensions: 81.5 x 61 x 37.5 mm (3.2 x 2.4 x 1.5")
  • Weight: 64 g (2.25 oz.)
  • Method: Colorimetric method


Whats Included

  • HI772 Checker
  • 2 sample cuvettes with caps
  • 1 bottle of alkalinity reagent hi755-26
  • 1 ml syringe and tip ­­­
  • battery
  • instructions
  • quick start guide.



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  • Fantaboulous By Andrew on 11/24/2016

    Measures alkalinity extremely accurate. Very happy with the tester and will look to get the calcium checker as well.
  • great product By Jennifer on 11/4/2016

    Ease of use and cost per test make this product one of my favs. I recommend getting the controls so you can make sure to know if your unit is reading spot on or up or down a bit. then just make adjustments to final reading to make sure it is within proper range.
  • Hanna Checkers are very easy to use and accurate By Joseph on 10/2/2016

    Love the Alkalinity DKH Colorimeter. Very easy to use, fast and, accurate. Its a definite buy.
  • Awesome By Cowboy Wayne on 9/19/2016

    Eliminates human inaccuracy.
  • Great! By Danny on 9/14/2016

    I absolutely love this meter. It's worlds easier and more consistent than the red sea pro alk test I used that changed its endpoint color hue over the months with two different batches of reagent.
  • Love it! By Mark on 8/29/2016

    This makes my life much, much easier since I like to test often. Takes less than a minute and is accurate!
  • Great product By Ronzek on 7/20/2016

    The ease of use has me sold on this checker!
  • Fastest and easist to test alkalinity By Chris on 6/23/2016

    This is the absolute fastest alkalinity checker around. fill the vial with water, put it in the checker, press a button, pull out the vial, add a single reagent, give it a shake, put it back in and one more press and you have your reading. The fact that this new checker reads in dKH is awesome. I'm testing more frequently which is allowing me to dial in my 2-part dosing pumps much more accurately.
  • very disappointed By Jared on 6/23/2016

    came up with a different reading 5 times back to back and not just off by .1 but 1-3 and yes i changed the reagent every test
  • Excellent Alk Test By Ryan on 6/14/2016

    Love it. Easy to use, fast and accurate. I highly recommend. Can't say the same for the Calcium Hanna test kit of which I'm going to review next.
  • Worth it for frequent tests By Jonathan on 6/12/2016

    Recently purchased this Hanna Alk checker. Due to the fact that I'm tuning my first calcium reactor and measuring alk daily, I wanted something with more consistent and reproducible results than titration. I previously used Red Sea Pro and Salifert titration kits, and while those are decent, and use good materials and reagents, my own shifting perspective on what color change to measure the reading at just simply made me feel like it was guess work at best. In this hobby stability is more important that some specific decimal point, so I like how consistent my readings have been with the Hanna checker, which saves me from my own shifting color perspective, if that makes sense. It's not really any faster or less messy than titration. Still have to clean the vial and the syringe tip, but the results are a lot more consistent from test to test.

    I still need to pick up the reference solution to be able to verify its accuracy over time as I have read it can shift over the years.
  • it is a junk By Leon on 5/31/2016

    my unit is 4 points off from the Red Sea test kit