Alkalinity DKH Colorimeter HI772 Hanna Checker - Marine Water

Alkalinity DKH Colorimeter HI772 Hanna Checker
Click on image to zoom
View full size image

More Views

  • 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

92% Recommend this to a friend (35 of 38)

SKU: 210018
Please wait...


1-3 day service on orders over $249

What's this?

You could earn
245 points
($2.45 off a future purchase!)
Ships Monday

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.


Ask a question

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
What the difference from this an the HI775?
Question by: alexander serrano on Mar 22, 2017 8:24:00 PM
Thanks for reaching out to us! The HI755 gives you a reading in PPM, which can be converted into DKH. The HI722 gives you a result that is already converted into DKH. Please let us know if you have any other questions!
Answer by: Eric Crees (Admin) on Mar 23, 2017 4:58:00 PM
This checker includes a tip with the syringe . Do I NEED to use three tip to get the properly calibrated reading. Or can I use the 1ml marking on the syringe
Question by: Steven Mashburn on Mar 6, 2017 2:28:00 PM
Hey there,
While there are those that do not use the tip for drawing reagent, the manufacturer does specifically recommend using the tip for the best consistency and accuracy, and we recommend following their directions.

Have a great day!
Answer by: Zack (Admin) on Mar 9, 2017 4:45:00 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.



Items 1 to 12 of 38 total

  1. 1
  2. /
  3. 2
  4. /
  5. 3
  6. /
  7. 4
  • Great! By Brandon on 4/15/2017

    Quick and easy way to measure your alkalinity.
  • Good Tester By Gary P on 3/27/2017

    Easy to use and quick results.
  • Great tester By NHLIVES on 3/20/2017

    I like the idea of not having to figure out where the top of the titration syringe is and where the endpoint is. At least with the reagent syringe there is a definite "top" marker and the result is at least consistent. I'm going to give the CA tester a try even though it isn't as highly rated..
  • Great product By Andrew on 3/4/2017

    Measures alkalinity with ease and love the instant display of what your DKH really is. I would recommend this reader to all reefers because it is easy to use and displays instant results.
  • Makes Checking Alkalinity a joy By Rick on 2/23/2017

    Is very easy to use compared to a test kit that is changing color as an indicator of alkalinity and I found myself questioning if it was done changing or I should add another drop of reagent.
  • Easy and Usefull By EDazzle on 2/23/2017

    Nice to get an actual number rather than guessing at a range based on my judgement of color. I prefer and am always at the lower end of acceptable DKH, right around 8.0. The digital readout allows me to test then dose small amounts of needed chemicals before testing again. I am able to see quickly how much the dosing impacts a change in the readings. If I drop to 7.8 or 7.9 I up my dosing until I am at 8.0 or 8.1 again. If I jump a little higher I turn my dosing down until I'm back where I want to be.

    I use this method and it works great with the other Hanna Checkers....
  • Easy to use but didn't last! By Pierre on 2/11/2017

    First, it is really easy and fast to use, seems accurate enough for the average Joe. I had mine for 8 months and it stopped working. (Error L.HI)

    I contacted Hannah support by email and got a reply within a few hours (Great!) Unfortunately, the warranty is 6 months only and because of the price range, there's no repair or return possible.

    Overall, great little tester, but it might not last!

    Some piece of advice:

    Store in a dry area, make sure no water ever touch it. Be sure you wipe any excess of water from the sample tube before insertion. Wipe again...and wipe...It will help for accuracy and longevity!

    Happy Reefing!

  • Above the rest By Mikesreef on 1/23/2017

    Fast and accurate is all I have to say. Worth the extra money.
  • Great Product By Greg on 1/14/2017

    Love the simplicity
  • Colorblind Perfect! By Nick on 1/10/2017

    So being shade blind it is hard for me to determine the proper levels in my tank. I usually just guess about and or around. But just ordered this Hanna Alk tester and right on point. Can't wait to get the other testers. Cost little bit more but well worth it because i'm not guessing anymore when checking my levels.!
  • Happy with the tester. Ease of use By William on 12/30/2016

    Happy with the tester. Ease of use
  • Great product By Mitch on 12/19/2016

    Works as stated. Removes the guess work from testing Alk.