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Hanna Instruments HI758 Marine Calcium Checker Test Kit - Saltwater Aquariums

3.8 out of 5 stars 45 customer reviews
| 8 answered questions

Price: $54.20 ($54.20 / Each) & FREE Shipping. Details
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Specifications for this item
Brand Name Hanna Instruments
Display LCD
EAN 0757901787669
Item Weight 0.64 ounces
Number of Items 1
Part Number HI 758
UNSPSC Code 41115300
UPC 757901787669
Volume 0.02  milliliters

Calcium presence in water supplies results from passage over deposits of limestone, dolomite, gyp... See more product details


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Product Features

  • Easier to use and more accurate than chemical test kits, less expensive than professional testing
  • Accuracy +/-6 % of reading at 25 degree C / 77 degree F
  • Large LCD screen for readability
  • Auto shut-off to extend battery life
  • Operated by a single AAA battery

Product Details

Spec Sheet [201kb PDF]| User Manual [669kb PDF]
  • Product Dimensions: 3 x 4 x 2 inches ; 0.6 ounces
  • Shipping Weight: 4.8 ounces (View shipping rates and policies)
  • Domestic Shipping: Item can be shipped within U.S.
  • International Shipping: This item can be shipped to select countries outside of the U.S. Learn More
  • ASIN: B005FH2OIY
  • Item model number: 1197H92EA
  • Average Customer Review: 3.8 out of 5 stars  See all reviews (45 customer reviews)
  • Amazon Best Sellers Rank: #6,404 in Industrial & Scientific (See Top 100 in Industrial & Scientific)
  • Manufacturer’s warranty can be requested from customer service. Click here to make a request to customer service.

Frequently Bought Together

  • Hanna Instruments HI758 Marine Calcium Checker Test Kit - Saltwater Aquariums
  • +
  • Hanna Instruments HI736 Phosphorus Ultra Low Range Checker HC for Saltwater Aquariums
Total price: $97.00
Buy the selected items together

Product Description

Calcium presence in water supplies results from passage over deposits of limestone, dolomite, gypsum and gypsiferous shale. Its concentration may extend from 0 to several hundred milligrams per liter, depending on its source and treatment. Calcium is necessary in plant and animal nutrition since it is an essential constituent of bones, shells and plant structures. Calcium in water as carbonate is one of the primary components of water hardness which can cause pipe or tube scaling. The HI 758 Calcium Checker HC is extremely simple to use. First, zero the instrument by adding Reagent A, deionized water and 0.1 mL of sample into the vial. Insert into the HI 758 and press the button. Next, remove the vial and add Reagent B and shake to dissolve. Reinsert into the Checker HC and press the button to read the calcium concentration in ppm on the display. Use for quick and accurate on the spot analysis. Single button operation: zero and measure. Range: 200 to 600 ppm. Resolution: 1 ppm. Accuracy at 25 degree C: +/-6% of reading. Light Source: light emitting diode at 610 nm. Light Detector: Silicon Photocell. Environment: 0 to 50 degree C (32 to 122 degree F); max 95% RH non-condensing. Battery Type: (1) 1.5V AAA. Auto-off: after 10 minutes of non-use. Dimensions: 81.5mm x 61mm x 37.5mm (3.2" x 2.4" x 1.5"). Method: adaptation of the zincon method.

Customer Reviews

Top Customer Reviews

I have owned the Hanna Calcium Checker for about a year now. I grow and farm Acropora and other hard corals. I have put it up against Salifert and API liquid reagent titration kits, and found it is right on the money. Occasionally, if YOU make a mistake, then the reading will be off. You MUST use RO/DI water. To some, this may be a pain. Since I am an advanced reef-keeper and farm acropora, it is not a pain for me, as I have plenty of ultra-pure water, as any reefer should for success. If you have a fish only tank, no point. After some time, the cuvettes may, or will, get scratches and need to be replaced. If you take good care of them, it won't happen. I find this unit to be both extremely affordable for what it does, and very accurate. Think of the human error in titration, by hand. It is little effort for me to first put in RO/DI water, a milliliter of a liquid reagent, get the unit "zeroed" with that solution, then add a few drops of tank water and a packet of dry chemical for color change. Pop it in, push the button again and in 5 seconds you have an excellent reading. Must have for reefers, in my opinion. It is definitely no more difficult than using the other chemical titration kits. I have become very adept at doing it.
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First, let me intro that I have had my calcium checker for over a year. It gave results that were consistent at first, but as time went on, and I didn't have to use it,things must have gone off. I checked my calcium two weeks ago and kept receiving high values. I then contacted Hanna who advised that they were going reformulating the reagents due to the issues they were having with users testing with them.

A few days ago, I received from Hanna a box with a new set of reagents and a small bottle of their deionized water. I promptly performed a test and then double checked it with my Red Sea test kit. The results were the same. I then, just to make sure, performed three additonal tests. They all were consistent. So, I thank Hanna for replacing and reforming the reagents. The kit in and of itself is very, very easy. The main thing was the reagents, so hopefully, things will continue to hold up well..
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The calcium checker worked perfectly for me. I was wary after reading the reviews but decided to pick one up and try it for myself. Like the other reviews have stated, you must use RO\DI water with less than 1 TDS. It doesn't need to be "lab grade". I have a basic refurbished Spectrapure RO\DI unit that produces less than 1 TDS water. What I do is fill one of the vials with RO\DI water and use that for testing purposes. I use the other vial to mix the sample and run the test. If you follow the instructions you should get accurate results. My first reading was 398ppm calcium, far more accuracy than I could have achieved using color charts. Hanna will also send you 0 TDS water if you contact them.
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This kit is poorly designed, difficult to use, inaccurate, imprecise, and has no business being sold as a consumer product. It tested in the high-500's for my tank when other traditional kits were testing in the low-400's. I emailed Hanna and they actually admitted that this kit requires lab-grade RO/DI water. That's right, the RO/DI unit you purchased for your tank will not help you here, even if it reads zero TDS. Even if your RO/DI water has just 0.1 ppm of calcium in it, your results could be way off. The test also uses a mere 2 drops of tank water, which makes it extremely sensitive. In other words, if you're off by 1/2 drop, your results are off by 25% (~100ppm).

The bottom line is, after getting results that were off by more than 100 ppm, how could I ever trust this kit again? I couldn't. I returned it. And, I'm not the only one. Countless others are having the same problem with this product.

Let me finish by saying that I like what Hanna does. I think their alkalinity checker is superb and I use it exclusively. I really wanted a way to test calcium easily and accurately, but I suppose I'll have to keep waiting.
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I am a saltwater hobbyist (like most of you) and I use Hanna meters for almost every test. The meter works PERFECTLY - the catch is that you must follow directions! All of the negative complaints probably stem from folks that don't follow instructions. Two drops of sample tank water is all that's needed. The rest of the sample (aside from the reagents) should be deionized water. Amazon sells it here: B0085XPBYY and it's not rocket science. I have used this meter for months and it's rock-solid.
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I've been maintaining my saltwater tanks for over 7 years. Test result accuracy is very important. I only used Redsea test kits for my mixed reef. I decided to give the Hanna Calcium test a try. The box it comes in is nice. It came with 2 vials 2 syringes, 1 colorimeter, 1 liquid reagent, and many packets of powder reagent. I personally did not like at the back and forth steps of this test. I also found it to be very inconsistent with it's results read out. I watched many videos on people performing this test to get different peoples way of doing it and also read the instructions many times to make sure I got the best accuracy. I would perform the test the first time and get a calcium reading out 550 then take it again and get a reading of 360. I personally would not recommend this test. I went back to Redsea and compared and again they did not match up at all.
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