Alkalinity Colorimeter HI755 Hanna Checker HC - Marine Water

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Alkalinity Colorimeter HI755 Hanna Checker HC - Marine Water

99% Recommend this to a friend (140 of 141)

SKU: 206201
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Quick Overview

Why does BRS recommend this?

The Hanna Alkalinity checker is an awesome little tool that will give you accurate easy to read results.  If you have bad eyes or have a hard time with titration test kits, the digital read out on the Hanna checkers is super nice and easy to read.  The biggest key with Hanna checkers is keeping the vials nice and clean for consistent results.  The Hanna Alkalinity Checker does give readings in Parts per Million, which can easily be converted to DKH or meq/L.

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

Does this product come with the alkalinity reagent?
Question by: Alexander on Nov 26, 2013 3:12:00 PM
Hi Alexander,
Yes the checker comes with reagents for about 25 tests.
Answer by: Bulk Reef Supply on Nov 26, 2013 3:12:00 PM

Full Details

Easier to use and more accurate than chemical test kits

Adaptation of Standard Method 4500-P E Accuracy 4% ±0.04 ppm (mg/L) of reading 0.04 ppm (mg/L) resolution (250 points) Large, easy to read digits Auto shut-off.

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: 0.00 to 300 ppm (mg/L)
  • Resolution: 1 ppm (mg/L)
  • Precision: ±5% of reading ±5% ppm @ 25°C
  • 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



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  • Exellent By Virgil on 11/30/2015

    Simple, easy, accurate!
  • Accurate and easy By Andrew on 10/10/2015

    no more trying to match colors
  • I like it but... By Carmen on 7/21/2015

    It looks like I am the only person who has had this problem, but that's okay. I was asked. After much deciphering on my part I was finally able to understand the direction. Actually the alkalinity test wasn't that bad, finally figured it out, and using the plastic box was easy. The only thing I would change is the language of the directions to something that would be understood by someone who escaped high school without any chemistry or biology classes--Thanks to my stellar education of the California public schools of the 60s. ;)
  • Great tester By Russell on 6/25/2015

    I love this tester. Its very quick to use and seems to be accurate. The only complaint that I have is that the lid doesn't always close all the way.
  • Well organised kit By Bill on 6/16/2015

    Sturdy and accurate
  • worth getting By miami angler on 6/10/2015

    works great It`s in ppm but simple math and it will be in KPH .065 x #on meter
  • Get it! By Joseph on 6/1/2015

    Wow! I bought this because I couldn't really see the color differences using the Red Sea kits which are great overall. I also figured I'd test more often if the testing process was faster and easier. This product is great. Fast, easy, accurate. I would say this is perfect for lazy reefers or those that can't see color well but instead I'll say this is perfect for smart reefers.
  • a must for a reefer By machote on 3/27/2015

    one of the items you need the most if you plan on reefing you cant just try to have corals with out alk test, and this is the best one for it speed and easy use
  • Nice for the color blind!!! By Mikey Reefs It on 3/25/2015

    After YEARS of having my wife make sure to check the color for me, well no more!!! This thing is accurate!
  • Great Product By Chris on 3/23/2015

    Fast and easy to use. If you only buy one Hanna checker, this is the one to own because it is clearly easier and faster to use than a traditional titration method.
  • Easy and fast way to test for alk By jent on 3/22/2015

    The tests are reproducible, and much easier to use than the other drip based methods I have used. I have always struggled to have reproducible results, but with this kit I absolutely can!
  • The only tester you need for alkalinity By Nick on 3/22/2015

    It is extremely straightforward and very simple to use. I get very accurate test results and do t have to fool around with liquid test kits anymore. The only thing you have to do is convert the result from parts per million to DkH.

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