Calcium Colorimeter HI758 Hanna Checker - Marine Water

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Calcium Colorimeter HI758 Hanna Checker - Marine Water

69% Recommend this to a friend (73 of 106)

SKU: 206202
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Quick Overview

Three simple steps to results. The Hanna Calcium 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 Calcium Checker, press the button and read the results. Done.

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Product Questions

Are the reagent packets really that hard to open and get into the vials?

It seems that the biggest/only gripe about this unit in the reviews is that it uses a powder reagent and not a liquid.

Is it really that hard to open the packet and get all of the powder in the vial?
Question by: G on Apr 20, 2016 11:16:00 AM
Great question!
We do not have issue with the packets, As long as the packet is shaken to the the power into one corner, The flap is then cut and the packet folded to allow the power to fall down the crease in the packet we have not had issues ourselves.
Answer by: Connor (Admin) on Apr 26, 2016 1:37:00 PM
does the hanna checker come with the reagents, or do I need to order regents separate?
Question by: jeremy on Nov 26, 2013 8:23:00 AM
Hi Jeremy,
The Hanna Calcium Checker comes with enough reagent to do about 25 tests.
Answer by: Bulk Reef Supply on Nov 26, 2013 8:23:00 AM
I would like to buy a Hanna checker for nitrate please but can not see one on
Your web site
Question by: Stuart ray on Apr 10, 2014 10:50:00 AM
Hi Stuart,
They do not make a Nitrate checker. If/when they do though we will bring it in.
Answer by: Bulk Reef Supply on Apr 10, 2014 10:50:00 AM

Full Details

Easier to use and more accurate than chemical test kits


The HI 758 Calcium Checker®HC is extremely simple to use.


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: 200 to 600 ppm
  • Resolution: 1 ppm (mg/L)
  • Precision: ±6% 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: Adaptation of the zincon method



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  • Results within range of accuracy By Stratos on 5/2/2016

    Although the Kh tester is much easier and straight forward this guy is a little trickier. The trickiest part of all is the reagent pouches that have to be emptied and I suspect that's the biggest factor of error. A lot of people complain about it's readings but the kit does say " ±6% of reading" which means that for a reading of 420 ppm the error is ±25 ppm. I find that acceptable since titration tests are hard to read especially for my eyes. All in all, the only thing I would suggest changing is the dispensing of the solid reagent.
  • Questionable accuracy By Larry on 4/25/2016

    While I LOVE the Hanna Alkalinity tester - I have issues with the Calcium tester.

    I ALWAYS test 2-3 times and will usually get 2-3 different results - sometimes VERY different.
    Which means I am going through the reagent very fast.

    It IS easier than the Red Sea kit but, If you don't get consistent results then you can't trust it. And if you can't trust it then why even bother.
  • Incredibly Useless By Ray on 4/16/2016

    I hate titration, but this test wins. First it was wildly inaccurate, probably because you need a full lab with bright lights, deionized water, and a way to empty the packet without spilling or breathing, and get it in a hole the size of a pencil. Return to sender this thing sucks. The test showed 200, red sea daily tests show 390. If they could find a way to dispense the packet, the show scissors cutting around it entirely like you would empty it into a stainless mixing tray with a pour spout or something. Then the syringe is barely readable except under metal halides. Ya, do not waste your money on this one. I love their KH though.
  • Not accurate or consistent. By Rick on 4/13/2016

    I had high hopes that this kit would make testing easier. I even bought another Hanna checker before this one even arrived. First, I've been reef keeping for nearly 20 years.

    I checked against two other test kits, both Salifert. Both kits said 390 +-6 over 2 tests each. Hanna said 361, then 470. That makes this test kit useless.

    Hanna, if you can fix the accuracy and consistency, I have a few suggestions. First, the packets are ok, but a scoop works just fine for me on the Salifert kits. For current users: I figured out quickly that opening the packet with scissors across one side then open it wide to form a nice sharp point makes is easy to get into the vial.

    I don't like the dropper to get the DI water into the vial. I remember high school/college chemistry. So, I knew to put the line at the half bubble of the water. A 10ml syringe would make that step easy. And possibly more accurate?

    Lastly, I'm only 44 so my eyes are still pretty good, but the instructions are in 2pt font. The box is big enough that I think a bigger font would easily fit in the box... and be kinder to the user.

  • Checks calcium, no better than others By ryan on 3/14/2016

    It's expensive and cool. It works, but my Red Sea test is actually more accurate and the testing process is nearly identical.
    Now that I have it and compare the two side by side, I regret buying it. I'm not bashing Hanna Checkers, I would love to get more, but this one is one I will be selling because I won't be using it.
  • Spend more time enjoying your REEF & LESS time testing By DAVID on 3/1/2016

    I have used API, and Red Sea in the past.I found Red Sea to be pretty accurate but this one gives the the exact reading which I would rather have then trying to figure what it is with Red Sea. I feel that with this testers, you can enjoy your reef tank more. I am going to get as many Hanna testers that I can get but will still have no choice to use some with Red Sea, which is fine with me.
  • Great Tool By Peter on 1/6/2016

    The Hanna Checker is a great investment. It is so much easier to use than test kits. I have been using it while setting up my dosing system and testing it against a Salfert test kit, I have stopped with the kit and rely on the hanna checker.
  • Best option available By jsbull on 1/2/2016

    This is a pretty involved test, so I don't like doing it, but this is accurate and the best I've found. I did screw up the first time, but have not had issues since I got the hang of the directions.
  • Good test kit By Eric on 12/27/2015

    Overall good, but like others, the reagent could be better than the little packets.
  • Exellent By Virgil on 11/30/2015

    I was weary of buying this checker after reading a lot of the bad reviews, but after receiving it, I tested my water 5 times back to back. With the red sea test reading 450ppm, my results were 454, 451, 458, 447, and 451. If you take your time and measure precise you will be very pleased as I am!
  • ::::::::::::::::::::::::::::)::::::::::::::::::::::::::::::::) By saro on 11/29/2015

    The best, i highly recommend it :)
  • Great! By FishRfly on 11/21/2015

    I like clarity of digital results and the ease of use. Though not as easy as the Alk checker that got me hooked on these testers... I am sold. Well worth the extra money spent. Found a YouTube video of the test being performed to be sure I was doing it correctly. Did manage to get so excited that I fumbled the bottle of reagent leaving me enough for 2 or 3 more tests :@ BRS look forward to my next order soon!

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