One Day Shipping
Shipped on:	Monday	Tuesday	Wednesday	Thursday	Friday
Arrives on:	Tuesday	Wednesday	Thursday	Friday	Monday

Two Day Shipping
Shipped on:	Monday	Tuesday	Wednesday	Thursday	Friday
Arrives on:	Wednesday	Thursday	Friday	Monday	Tuesday

Three Day Shipping
Shipped on:	Monday	Tuesday	Wednesday	Thursday	Friday
Arrives on:	Thursday	Friday	Monday	Tuesday	Wednesday

Four Day Shipping
Shipped on:	Monday	Tuesday	Wednesday	Thursday	Friday
Arrives on:	Friday	Monday	Tuesday	Wednesday	Thursday

Hanna Instruments Checker Marine Calcium Colorimeter

4.6

$49.95

Only 8 left - order now!

In stock in our East and West Coast warehouses

The Hanna Marine Calcium Checker® bridges the gap between simple chemical test kits and professional instrumentation. Chemical test kits have limited accuracy and resolution since they rely upon the human eye to discern differences in color. Professional instrumentation incorporates a light source such as an LED or tungsten lamp with a filter and a light sensing detector to precisely determine absorbance and ion concentration. Professional instrumentation offers greater resolution and accuracy but can cost hundreds of dollars. The Hanna Marine Calcium Checker® uses a fixed wavelength LED and silicon photo detector to provide the accuracy of professional instrumentation at the affordable price of a chemical test kit.

The HI758 Checker® HC (Handheld Colorimeter) provides a simple, accurate and cost-effective way to measure calcium. Required for the development of calcium carbonate skeletons of coral reefs, calcium is a crucial component of marine waters. Designed as a more accurate alternative to chemical test kits, the HI758 provides quick, accurate results in a few easy steps.

Weighing a mere 64 g (2.25 oz.), the Checker HC easily fits into the palm of your hand or pocket!.

Ideal for Aquaculture and Aquarium testing!
Easier to use and more accurate than chemical test kits!.
Large, easy to read digits.
Auto shut off.
Operated by a single AAA battery
Use for quick and accurate on the spot analysis.
Single button operation: zero and measure.

Specifications:

Range: 200 to 600 ppm
Resolution: 1 ppm
Accuracy: +/- 6% of Reading
Battery Type: 1 - 1.5V AAA

Includes

Calcium Checker
2 - Sample Cuvettes and Caps
Reagent Start Kit for 25 Tests
Battery
Instruction Manual

How it works:

The Hanna Marine Calcium Checker® HC HI758 is designed to make testing quick and easy.

Press the button to power the meter on. Notice “Add C1” appears on the screen. You are now ready to begin testing.

Using the 1mL syringe, add 1mL of reagent A to the cuvette. Then, using the dropper, fill the cuvette to the 10mL mark with deionized water. Distilled water is also acceptable. Once the reagent and water are added, invert the cuvette five times to mix.

Using a microfiber cloth, wipe the cuvette to remove any oils or fingerprints from the glass. Then, place the cuvette into the checker and close the lid, making sure it is completely closed. It is important to make sure that the lid is completely closed for an accurate reading.

Press the button. Once the screen shows "Add C2", remove the cuvette from the meter.

Add 0.1mL of sample. For best accuracy, use the supplied 0.1mL pipette. Note: To use the Hanna Instruments Micropipette, first attach the pipette tip. Push the button to the first "stop", and then immerse the tip into the sample. Slowly release the button to its original position. Then, wait two seconds to catch any drops before dispensing the sample into the cuvette to the second "stop".

Once the sample is added, add one packet of reagent B to the sample. After that, cap the cuvette and shake vigorously for 15 seconds. Wait 15 seconds for bubbles to dissipate.

Wipe the cuvette of any oils and fingerprints, and place back into the meter. Press the button; The meter will directly display the concentration of calcium in ppm.

The Benefit of Testing for Calcium

Calcium is an essential ingredient to a healthy and functional reef aquarium. Corals and coraline algae require calcium for calcification and growth, so much so that an aquarium stocked with these organisms require regular calcium supplements in order to maintain healthy levels. A variety of commerically available supplements exist, from calcium salts to buffered calcium supplements, which raise both calcium and alkalinity. Many aquarists set up a regular supplementation schedule to maintain proper calcium levels. However, regular calcium monitoring is crucial to a healthy reef aquarium, even if such a system is in place. This is because as corals and coraline algae grow and mature, their requirements for calcium tend to increase. As a result, the growth of the aquarium might outpace the calcium supplementation regimen. The ideal range for calcium in a healthy reef aquarium is between 380-450ppm. Values below 380ppm may slow the growth of corals, whereas high levles of calcium (>500ppm) puts the tank at risk for calcium carbonate precipitation (limestone formation).

The Limits of Traditional Color-Change Test Kits

Many test kits on the market rely on a color change that needs to be judged by eye. These are notoriously difficult to use, especially in the lower ranges. The Hanna Marine Calcium Checker® HI758 bridges the gap between simple chemical test kits and professional instrumentation. The one-button design makes testing for calcium a cinch to use.

Product Manuals & Documentation

Hanna Instruments Checker Marine Calcium Colorimeter

Owner's Manual available for download in Adobe PDF file format

Manufacturer Info

Hanna Instruments USA Aquarium Supplies
Hanna Instruments is a leading manufacturer of analytical aquarium instrumentation. They were founded in 1978 and are headquartered in Woonsocket, Rhode Island. When Hanna introduced pH Electronic Paper in 1986 it literally revolutionized the world of testing by allowing millions of people in various industries to test for pH in a simple, accurate and affordable way. Hanna employees are constantly challenging themselves to improve on existing technology and to invent new testing techniques with the common goal to simplify analytical testing. This applies not only to instrumentation, but also to sensors development, reagents and chemicals. Hanna also believes in controlling the quality of their products from inception to delivery so they manufacture everything themselves, from meters and electrodes to chemical reagents and buffer solutions.

Ask a Question Earn 15 Points when you answer a question

Sort By :

9 Questions

Displaying questions 1-9

If using a micro-fiber cloth to clean the cuvette is so important, why doesn't Hanna include one in the kit?

Asked : Oct 24, 2018
By : skippy

Answer Question

Hi Skippy, they recommend using a lint-free cloth to wipe the outside of the cuvettes prior to inserting them into the checker. We use paper towels to dry the cuvette.

Answered : Oct 29, 2018
By : Kat

Does this kit come with the .1ml pipette?
?

Asked : Apr 12, 2017
By : Brad

Answer Question

The .1ml Pipette is included.

Answered : Apr 14, 2017
By : MD Tech

Write Your Review Earn 15 Points when you write a review

Sort by:

Overall, others give this:

20 Reviewers (90%) would recommend this

Overall Rating:

<< Previous

1 2 3

Next >>

5.0

so much better

danielle

Sat, Oct 20, 2018

PROS
easy, accurate, fast

CONS
slightly longer process than other hanna kits

REVIEW

I'm so glad I finally invested in one of these. Takes all the guess work out of your testing process. Super accurate, super reliable, very easy. Make sure you take your fingerprints off the tubes though! Read all instructions before use

Was this review helpful: Yes(0)No(0)

5.0

Easy to use

kingrowland1217

Tue, Oct 9, 2018

PROS
Easy to read, easy to use

CONS
none

REVIEW

Very easy to use. Gives you a straight reading. No guess work or color matching. Just wish they made them for other nutrient tests

Was this review helpful: Yes(0)No(0)

5.0

Only regret not getting one sooner!

Pnwreefn

Sat, Aug 11, 2018

PROS
Easy to use and accurate

CONS
Few more steps involved

REVIEW

A few more steps involved and have to really follow instructions but it’s well worth it to be able to test accurately.

Was this review helpful: Yes(0)No(0)

5.0

Good Product

Ewilson

Mon, May 7, 2018

REVIEW

A few more steps to take than the Alk checker but still feel it is accurate and worth those few steps. Better than the process other kits have.

Was this review helpful: Yes(0)No(0)

4.0

No more counting drops! But follow instructions exactly.

Dawn

Tue, Apr 10, 2018

PROS
Digital readout

CONS
Tiny sample size/dilution magnifies errors; you must use extreme diligence to follow directions exactly.

REVIEW

You absolutely must use deionized or distilled water, and clean vessels that have ideally never touched salt. I was getting crazy high readings when calibrating with water from my own DI unit, until I realized it had been made in buckets that have also held salt water in the past. Results were way...Read More

Was this review helpful: Yes(1)No(0)

5.0

Quick and easy to use

mygolfisslow

Tue, Mar 13, 2018

PROS
Quick and accurate

CONS
a bit more complicated than the alk checker.

REVIEW

I won the calcium and alkalinity checkers years ago in a raffle. The older model that I have is not as easy or accurate as the newer style. The updated pipettte makes a word of difference. If you have an older kit I would definitely advise getting the newer pipette. It leads to a bit less user error...Read More

Was this review helpful: Yes(1)No(0)

5.0

Nice upgrade!

CamoReefer

Tue, Feb 27, 2018

PROS
Accurate, easy to operate, good storage

CONS
None

REVIEW

I recently upgraded to this Hanna checker after using Salifert kits for the past 2 years. I am very happy I did! This product takes the guess work out of reading colors. I feel more confident that my parameters are in check. Highly recommend this product!

Was this review helpful: Yes(0)No(0)

Write Your Review Earn 15 Points when you write a review

Sort by:

Overall, others give this:

20 Reviewers (90%) would recommend this

Overall Rating:

<< Previous

1 2 3

Next >>

Free, Fast, and Flexible Shipping Options

$2.99 flat rate shipping for orders under $29
Most orders under $29 ship for only $2.99 using a mix of economy shipping methods including UPS Ground, USPS First Class, and/or SurePost. Your order will be delivered in 1-7 business days after it ships out.
free shipping for orders $29+
We ship 99% of the products we carry for free within the contiguous United States using a mix of economy methods including USPS First Class Mail, SurePost and UPS Ground. Your order will arrive in 1-7 business days. Just spend $29 or more!
free faster shipping for orders $250+
Over 90% of shoppers receive their orders within 2 business using UPS Ground. Upgrade from free economy shipping to UPS Ground for only $2.99—or spend $250 and we’ll upgrade you automatically!
need your order even faster? no problem!
Expedited shipping services are available for most products if you are in a hurry. Get guaranteed delivery in 2 business days, 1 business day, or next day by 10:30 am. Costs vary by location.
buy it today and we'll ship it today
Same-day shipping is available Monday-Friday for most products—place your order by 10:30 am PST. Pre-ordered and back-ordered items do not qualify, nor do drop-shipped, live, or frozen shipments.
live plants, live foods, and frozen foods delivered to your door
We ship live plants, live foods, and frozen foods within the contiguous United States. Each of these categories is subject to its own $19.99 flat-rate shipping fee to cover the special packaging and/or expedited shipping costs required to ensure safe delivery. Orders with 12+ live plants ship free!

Learn More About Shipping

60-Day Return Period with Easy Online Returns

Return any new and unused item within 60 days for a full refund. Having difficulty with a product? Contact us to speak with an aquarium expert. If you need a replacement, fill out this form.

A small segment of the 180+ brands we carry require that customers contact them directly if/when problems arise. You can view the full list of those brands and get their contact info here.

Marine Depot is an authorized reseller for every product we carry. That means when you buy aquarium supplies from us, your products are not only backed by our own 60-day return policy, they also carry full factory warranties, where applicable. Some items have a 1-year warranty, others have limited lifetime warranties. Warranty coverage varies from manufacturer to manufacturer, so please read the product description of the item(s) you are considering thoroughly for details or contact us if you have warranty questions.

Learn More About Returns

Earn 5% Cash Back for Most Purchases

Rack up reward points to earn discounts on future purchases! You can earn reward points by creating an account, writing reviews, referring friends, subscribing to our newsletter, buying products, and more!

Earn 5 reward points for every $1 you spend to get 5% cash back
Most Products
Earn 1 reward point for every $1 you spend to get 1% cash back
AquaIllumination, CoralVue, Digital Aquatics, EcoTech Marine, IceCap, Innovative Marine, Kessil, Korallen-Zucht, Maxspect, Nano Box, Neptune Systems, NYOS, Oceanbox Designs, Pax Bellum, Red Sea, Reef Glass, Reef Octopus, Somatic, and Vertex Aquaristik

You can also get bonus reward points by purchasing select items during special sales and promotions.

Learn More About Rewards