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Alkalinity Colorimeter HI755 Hanna Checker HC - Marine Water

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Alkalinity Colorimeter HI755 Hanna Checker HC - Marine Water

100% Recommend this to a friend (127 of 127)

SKU: 206201
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Quick Overview

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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Previously Asked Questions

  • by Alexander on November 26, 2013, @3:12 PM

    Does this product come with the alkalinity reagent?

    Bulk Reef Supply Hi Alexander,
    Yes the checker comes with reagents for about 25 tests.

    Do you find this question helpful?  Yes   No

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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  • Very Easy to use By Dave on 2/23/2015

    Took me about 5 minutes to read the instructions and perform my first test. Very easy to use.
  • Love this tester By Christopher on 2/11/2015

    This test has got to be the absolute easiest of them all. Fast readings and its great to have a pin point reading rather then a whole number. Good for measuring alk usage and dosing.
  • Works Great No More Guessing By Ceasar on 2/4/2015

    Easy to follow directions, not very tedious, and most important of all accurate.
  • Fantastic By CraigD on 1/27/2015

    This is the way to do testing! Easy to perform and read the results, not to mention fast.
  • EASY TO USE By KONQUEST on 1/18/2015

    I tested my alkalinity at home with the hanna checker and then had my local fish store test my water with their hanna checker and it was off by like 15ppm ,found that kinda weird but anyways they work great and easy to use
  • Awesome By Marine1 on 1/17/2015

    Best alkalinity tester on the market!
  • Easiest and quickest alkalinity test available By JD3 on 1/12/2015

    This test is so easy to do. Its alot quicker than going drop by drop like on some other test kits and what better way to see the results than with a digital display.
  • worth every cent! By CaliOCorals on 1/8/2015

    Only downfall is you need to do some math to get dkh. 1ppm=0.056dkh.

    So example is device displays 145ppm (145ppm x 0.056 = 8.12dkh)
  • nice piece of equipment By Daniel on 12/28/2014

    Makes checking alk as easy as possible. Very accurate.
  • Forget the dropper kits By David on 12/22/2014

    This is way easier than test tubes and counting drops. And gives an accurate readout on a digital display
  • Simple, easy, accurate. By DivingTheWorld on 12/19/2014

    Simple to use and accurate readings.
  • Works Like a Charm By ncoble4 on 12/15/2014

    This test kit is easy to use and works as advertised. The only reason it does not get 5 stars is that the bottle of reagent does not seal properly after it is opened for the first time. I found this out the hard way by screwing the cap back on, placing the bottle back in the plastic box and putting it on the shelf. The next day when I went to test, the reagent had all leaked out in the box so I had to order more. :(

    Now I keep the reagent upright on the shelf separate from the box.

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