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Hanna Instruments HI758 Marine Calcium Checker Test Kit - Saltwater Aquariums

4.6 4.6 out of 5 stars 714 ratings
Amazon's Choice highlights highly rated, well-priced products available to ship immediately.
Amazon's Choice in Aquarium Test Kits by Hanna Instruments

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Purchase options and add-ons

Brand Hanna Instruments
Target Species Fish
Material Dolomite
Special Feature Lightweight
Item Weight 1 Pounds
Style Modern

About this item

  • 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

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Product details

  • Is Discontinued By Manufacturer ‏ : ‎ No
  • Product Dimensions ‏ : ‎ 3 x 4 x 2 inches; 1 Pounds
  • Item model number ‏ : ‎ HI 758
  • Batteries ‏ : ‎ 1 AAA batteries required.
  • Date First Available ‏ : ‎ August 8, 2011
  • Manufacturer ‏ : ‎ Hanna Instruments
  • ASIN ‏ : ‎ B005FH2OIY
  • Customer Reviews:
    4.6 4.6 out of 5 stars 714 ratings

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.

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Customer reviews

4.6 out of 5 stars
4.6 out of 5
714 global ratings

Customers say

Customers like the performance, accuracy, and speed of the vivarium kit. For example, they mention it works perfectly, is great for checking calcium levels, and is faster than the API test kits. However, some customers have mixed opinions on ease of use, and appearance.

AI-generated from the text of customer reviews

44 customers mention32 positive12 negative

Customers like the performance of the calcium checker. They say that it is easy to use, accurate, and fast. Some customers also mention that the readings are spot on.

"...For the long term, I will definitely be using this since it has similar accuracy, but is MUCH easier to use and cheaper overall." Read more

"...I tested 4 more times over the next 2 days and the readings are spot on. If you don't have one... buy it now, you won't regret it" Read more

"...in the same amount of time as the visual method and have consistent accurate readings... no-brainer" Read more

"...I have to admire the Bang for the buck with API kits, the accuracy is just not good enough for serious tanks but is certainly good enough for FOWLR..." Read more

10 customers mention7 positive3 negative

Customers like the calcium level of the vivarium. They say it's great for checking calcium levels, the meter is nice, and the digital readout is great.

"...I love the digital readout and the way these kits work, I cannot see myself using color wheels again unless Hanna does not have a kit for that..." Read more

"...If you follow directions this unit is perfect for monitoring your calcium levels." Read more

"Ughh testing for calcium is painful. There isn't a much better option for calcium testing on amazon in my opinion...." Read more

"...I think their alkalinity checker is superb and I use it exclusively...." Read more

4 customers mention4 positive0 negative

Customers are satisfied with the speed of the product. They mention that it is easier and faster than the API test kits.

"...Results are nearly instantaneous. Also much easier than trying to figure out comparison to color charts that look different in different lighting...." Read more

"...Takes the guesswork out! Easy to use and fast. It come with battery, and enough testing for 25 tests. I wished I’d bought this in the beginning." Read more

"...The meter is nice and quicker than the API test but I'm it sure if I trust the accuracy of the colorimeter...." Read more

"Worked as described, Easy to Use, Accurate, Fast" Read more

3 customers mention3 positive0 negative

Customers are satisfied with the value of the vivarium. They mention that it is worth the money and they are happy with their purchase.

"...this since it has similar accuracy, but is MUCH easier to use and cheaper overall." Read more

"...Certainly worth the money and I am very happy with my purchase, I have ought several other hanna checkers." Read more

"Its the best calcium checker for the money just make sure to do 2 test in a row to make sure it is working." Read more

29 customers mention20 positive9 negative

Customers are mixed about the ease of use of the vivarium. Some mention that the instructions are easy to understand, and the test is easy to perform. However, others say that the steps to the test are a bit tricky, and it's hard to use the powder packet.

"...you don't have to look at anymore color charts and the test are so much easier to perform than the old school stuff...." Read more

"...definitely be using this since it has similar accuracy, but is MUCH easier to use and cheaper overall." Read more

"...The powder reagent is kind of a pain to add and you have to be careful adding it. Also the price of replacement reagents is not cheap...." Read more

"after using one or two times its very simple to use ...." Read more

5 customers mention2 positive3 negative

Customers are mixed about the appearance of the vivarium. Some mention it's very nice, while others say that it' s poorly designed, difficult to use, inaccurate, imprecise, and cheaply made.

"...You can't just throw it around and expect it to work. It is cheaply made vs the real deal lab grade calcium testers...." Read more

"nice product , but no fit my need" Read more

"This kit is poorly designed, difficult to use, inaccurate, imprecise, and has no business being sold as a consumer product...." Read more

"Very nice" Read more

Great product
5 Stars
Great product
Works great very accurate follow directions very simple to use, no more counting drops is gonna be nice. Comes with a nice plastic case and everything u need to run the tests.
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Top reviews from the United States

Reviewed in the United States on February 20, 2016
29 people found this helpful
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Reviewed in the United States on September 18, 2014
4 people found this helpful
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Reviewed in the United States on October 9, 2014
2 people found this helpful
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Top reviews from other countries

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Brad k
5.0 out of 5 stars Great product
Reviewed in Canada on April 1, 2023
André S.
5.0 out of 5 stars Sehr gut
Reviewed in Germany on February 12, 2022
jim mcferran
5.0 out of 5 stars Five Stars
Reviewed in the United Kingdom on February 18, 2015
One person found this helpful
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Gisele M.
5.0 out of 5 stars Very accurate and easy
Reviewed in Canada on March 22, 2023
Bitter Petra
5.0 out of 5 stars Klasse
Reviewed in Germany on February 19, 2022
One person found this helpful
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