Alkalinity PPM Colorimeter HI755 Hanna Checker - Marine Water

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Alkalinity PPM Colorimeter HI755 Hanna Checker - Marine Water

98% Recommend this to a friend (165 of 169)

SKU: 206201
In Stock: 18
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Quick Overview

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.


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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  • Difference in Checkers By Alan on 9/30/2017

    What's the difference in the Alkalinity Checkers? H1772 and H1755? The Hanna Reps at Reefapalooza sold me the H1755 reagent solution for the H1772 checker they sold me. Told me they were the same. Please advise.
  • Got this on Sale - Glad I did By Bob E on 9/7/2017

    Put off buying this due to price and had 2 different titration kits I wanted to use up. Got this on sale and decided this is the time. Open box and 5 min to first result. Took 2 min second test. My test shows too high. I'm going to slowly drop dosage and monitor daily. 4 stars as the tray in box is an afterthought on Hanna's part. The conversion is real easy so saving $9.00 on the sale was OK. Also Apex Fusion does the conversion automatically if you enter your test data. Converts from ppm to dKH. Overall, I do like the test
  • Easy to use, quick, and accurate By Jack on 4/28/2017

    The results compare directly to Salifert and API. The accuracy and consistency seem very good. Make sure you measure 1.0 ml of the reagent and keep the vial clean when done. Rinse with RODI each time and store vial inverted to dry. Simple and quick.
  • Waste of money By swiftvision on 4/5/2017

    Never was accurate, even after replacing the calibration fluid. I mean it was so far off it almost killed my tank.
  • Very easy to use By Mike on 3/23/2017

    This is a great checker. The digital read out is really nice. So much better than counts drops and shaking like the Red Sea kit.
  • Great Product By Joseph on 1/15/2017

    This product takes the pain out of testing manually. Loved it!
  • Digital Results By jag909 on 10/31/2016

    No Guessing, digital readout, i am sold! Great to have a definite number to go with the results.
  • So much better. By TrentN on 7/26/2016

    Now this it a tester I like. the only way it could be easier would be if it was a probe. I made the mistake of ordering the ppm tester when I wanted the dKH one, but in the package has a sheet that has the multiplier to go from ppm to dKH so no biggy.
  • Pluses and Minuses By John on 5/16/2016

    Pluses - Easy and fun to use, which means I'm testing more; it's accurate.

    Minuses - You have to manually do the conversion to DKH or meq/L, which seems odd for an electronic device. The box is comes in is funky and not designed well. It's not as fast as some say, but still easier and faster than a Red Sea type tester. The instruction manual is simple to understand, but a little weak on information.
  • The best…..when it works By Mcmullen on 4/8/2016

    So this is easily the best Alk checker when Hannah has their reagent working properly. Sometime in Novemeber 2015 (maybe sooner) they changed packaging so that when the liquid reagent encounters the bottle lid, it somehow deactivates the reagent. This was addressed, and supposedly fixed! Well, guess what? Still same problem!! I finally ordered a "Salifert" kit and my Alk level tested higher than the max level…..the max is 15.8! I kept dosing Alk based on my Hannah reading low levels. For those of you that do not know, anything higher than 12 is high for Alk, and my tank runs about 9. This is a sps killer. I do believe Hannah will fix the problem but how can you trust the product. I'll constantly be double checking!! I cannot recommend at this time!!!
  • Excellent and easy to read. By DAVID on 4/3/2016

    I find this one easier than API or Red Sea to read. I just made a ALK Table with the reading and dkh. So all I have to do is look at my chart.
  • SUPER EASY TO USE! By TWang on 3/1/2016

    This is very easy to use and is accurate. Kind of pricey but well worth it.


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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
I have started using this Alkalinity check and have noticed that the tests come back much lower than the Salfert test. I thought it was old reagents and purchased new ones I test 6.5 KH to salfert 11 dKH. I do the ppm match "ppm * .056 = dKH"
Still reads much lower than Salfert.

Even with the 5ppm error range in the Hanna. I can not make heads or tails on this.
Question by: mholzapfel on Jun 4, 2016 11:13:00 AM
Hey there,
I am sorry to hear about the differences in your test kit. We have had great luck with hanna in the past and certainly have used their products and standards regularly. At this point we recommend reaching out to hanna to ensure the checker is up to par and functioning correctly with the use of standards or other re-calibrating effects.
Hanna Instruments – 800-426-6287
Answer by: Connor (Admin) on Jun 9, 2016 12:49:00 PM
Hi would you ship to the UK on a large order please
Question by: andy Hartley on Jan 30, 2016 4:43:00 AM
Great question,
Unfortunately we are only able to ship to the US and Canada at the moment. Feel free to let us know if you have any further questions!
Answer by: Connor (Admin) on Feb 9, 2016 4:31:00 PM
where can I buy the reagent?
Question by: Richard Granofsky on Apr 19, 2016 3:05:00 PM
Hey there,
I have attached the link below. Feel free to let us know if you have any further questions!
Answer by: Connor (Admin) on Apr 19, 2016 6:24:00 PM