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 Testing With Hanna's HI772 DKH Checker - BRStv How-To
  • 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 (45 of 49)

SKU: 210018

reg. $49.00

Special Price: $36.75

In Stock: 13
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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.


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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  • do not waste your money By chris on 11/1/2017

    Product works great for 1 year and 4 months then the button breaks. I was very careful and gentle with the instrument. I contacted BRS and they say its our of warranty. I contacted Hanna and they say the same. This product should last longer.
  • Good Product By Ksf1 on 10/31/2017

    I've sed the Hanna Checker for phosphates for years, but continued to use a Salifert test kit for Alkanity. This is a huge improvement. Not that the Salifert kit was bad, but difficult to confirm consistency using the color chart and possible errorts in the drip test.
  • Well Worth It By Xxero on 10/20/2017

    Easy instructions. After you run the test a couple of times, the whole process only takes minutes. 100% happy with this product!
  • Love It By Zotch on 9/22/2017

    Quick accurate reading and simple to use. Video is very helpful..Randy is the man.
  • Very easy to use By Bakerrichard27 on 9/1/2017

    I absolutely love it no more color guessing very smooth easy operation and extremely accurate
  • Fast and easy By GP on 8/29/2017

    Very easy to use and gets fast results.
  • Easy Alkalinity testing By john on 8/21/2017

    I love the digital result verses the color change result. The test is easy and very quick. I won't go back to titration method tests.
  • Makes checking Alkalinity easy! By Phil on 8/8/2017

    This meter makes checking Alkalinity very easy. I used to dread testing, but now it's actually a pleasure to do. I will never go back to the old count the drops system.
  • This is the Bee's Knees. By Albert on 8/1/2017

    I test Alkalinity every other day and when I start a new tank I will often test my tank water both before and after a water change as well as the WC water.. Doing an alk test so quickly is a god send. If you just got this thing and think its a little slower to use than you thought dont worry in about a week of use you'll be doing it at blistering speed.
  • Very accurate By Nicholas on 7/17/2017

    Worth the money, a lot of other test kits are hard to read and take 3 times as long to get the result.
  • Does the job By Sponge bob on 5/5/2017

    When I purchased the unit it would not turn on , changed battery and still would not operate, called BRS and they sent a return label in 5 minuets, I got ready to ship and it was working.
    So I kept it. Definitely a cost effective precision test unit at 50 bucks so don't expect lab grade hardware at hobby prices.
  • Great! By Brandon on 4/15/2017

    Quick and easy way to measure your alkalinity.


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
Do you use the extra tip for the syringe just to fill the syringe with the reagent or do you fill the reagent to 1mill+extra tip full into the vial? thanks!
Question by: Benjamin on Apr 28, 2017 6:00:00 PM
Hey there,
The tip should be attached to the syringe prior to drawing the reagent fluid. You will want to draw the plunger to the 1mL mark, and the actual fluid will not actually be drawn into the syringe, but will just be drawn into the tip. This ensures more consistent dosing, and avoids fluid fouling the syringe portion.

Hope this helps!
Answer by: Zack (Admin) on May 1, 2017 5:55:00 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