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Calcium Colorimeter HI758 Hanna Checker HC - Marine Water

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Calcium Colorimeter HI758 Hanna Checker HC - Marine Water

67% Recommend this to a friend (58 of 87)

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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Previously Asked Questions

  • by Stuart ray on April 10, 2014, @10:50 AM

    I would like to buy a Hanna checker for nitrate please but can not see one on
    Your web site

    Bulk Reef Supply Hi Stuart,
    They do not make a Nitrate checker. If/when they do though we will bring it in.

    Do you find this question helpful?  Yes   No

  • by jeremy on November 26, 2013, @8:23 AM

    does the hanna checker come with the reagents, or do I need to order regents separate?

    Bulk Reef Supply Hi Jeremy,
    The Hanna Calcium Checker comes with enough reagent to do about 25 tests.

    Do you find this question helpful?  Yes   No

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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  • Simply Trash No Matter HOW Accurate You Are By Mikey Reefs It on 3/25/2015

    I've done this test over two dozen times and its just off. Unlike the Alk Hanna, this one just does not work good. My numbers are off by a good 100ppm. Iv'e removed the tip, added the tip to the needle and still inaccurate. SAVE YOUR MONEY.
  • Good for those who prefer colorimetry over titration By Chris on 3/23/2015

    This product works well. Unfortunately, the method is a little more complicated than the Alkalinity method so it is not necessarily faster/easier than a titration if you have good color vision. I'd would also point out that the method is highly sensitive to contamination. Make sure you use good clean DI water, a little slat creep in your DI water storage container will completely mess up the results.
  • very accurate - but you need to be very precise. By Justin on 3/23/2015

    I like this unit because it give me the sense of knowing that my Ca in the tank is spot on when I take my time and measure out the exact amount of water going into the test kits and following the instructions to the T.

    A single drop extra can throw off the measurement, so you have to be very accurate. I like to use the Red Sea kit in conjunction with this tester every now and then to make sure I am being accurate, but overall it takes the guess work of out having to read colors. Just take your time, double check that you are being precise and you will be happy with the results.
  • inaccurate and tedious to use By fruth on 3/11/2015

    When I first tried this, I got a constant blinking 600 using RO water. I bought deionized water, and then I got 355. My Red Sea test kit showed 420 for the same sample. I contacted Hanna. They sent me Deionized water and a syringe. I tested it again and same thing (365), Red Sea Test Kit 430. I then tested a fresh mix of Red Sea Coral pro salt, which claims to be 450 CA. With the Hanna, I got 375, with the Red Sea test kit I got 425.
    The Hanna is tedious to use. You need to use a magnifying glass to be accurate enough doing the test. And in my opinion, it has questionable accuracy in test results. Not to mention that the cost per test is twice that of the Red Sea when you buy the refills.
  • Great tester thats easy to read By Christopher on 2/11/2015

    Love this tester, no more counting drops, or measuring the amount of reagent used. Worked great at fist then everything got stuck at 600ppm. Contacted hanna and their customer support was top notch, sent me a new set of reagents and even a bottle of their own DI water for testing. Now my testing is right back to being spot on.
  • Accurate and Easy By Ceasar on 2/4/2015

    Makes testing really simple. Just add reagent fluid, fill to 10 ml line with ro water, and add reagent powder. Once a month i just check to make sure that everything is working perfectly fine by checking the calcium on my newly mixed reef crystals water and I come up with the same reading each time.
  • Easy to use and accurate By Ceasar on 2/4/2015

    Everyone can agree that testing can be a pita, but with hanna it is a breeze. Just collect some water from your aquarium and add some reagent, and place into the tester. Eliminates the headache of wondering if you matched it to the right color on the chart or not.
  • Accurate, but takes getting used to By Keith on 2/2/2015

    This is a very accurate tester, but you need to follow the directions to the letter or you will get a blinking 600 reading.
  • Great Results By Craig on 1/28/2015

    The Checker is the way to go! While it takes a few more steps to perform the test the results are quick, and easy to read.
  • Constant and Reliable By MIke on 1/14/2015

    I have been testing with kits for years. Hanna has does it again and provided an affordable and reliable solution and has eliminated the eyesight guessing game. If you can follow instructions and accuracy is what you are after, this meter is for you.
  • Good product By Joshua on 1/13/2015

    A little complicated at first but acurate can't go wrong with this product
  • ro/di with zero tds is the key! By CaliOCorals on 1/8/2015

    Your readings will be off if you use any water but Ro/di with 0 tds.. make sure to add the 1ml of reagent A before adding the 9ml of ro/di. Make sure your level when filling to the line..

    DO NOT GET WATER IN THE DEVICE! which means wipe the vial clean before it goes in every time.. if the vial or inside of the device isnt clean your reading will be off.

    Wish it was cheaper per test.

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