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The Hanna Marine HI772 Alkalinity (dKH) 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. This level of instrumentation also offers greater resolution and accuracy, but can cost hundreds of dollars. The Hanna Marine Alkalinity 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 HI772 Checker®HC (Handheld Colorimeter) provides a simple, accurate and cost effective way to measure alkalinity in degrees of calcium hardness, commonly abbreviated as dKH. Critical to marine environments, alkalinity not only provides the carbonate ion required for calcium carbonate skeletal regeneration of coral reefs, but it also acts as a pH buffer against large changes in acidity. Designed as a more accurate alternative to chemical test kits, the HI772 provides quick, accurate results.
Why Test Alkalinity?
Alkalinity is the ability of a system to buffer the pH of a system as acids are introduced. In saltwater systems, alkalinity is present in two main forms; carbonate (CO32-) and bicarbonate (HCO3-). Alkalinity is a critical parameter to check for in aquaculture, especially in reef aquariums where drastic pH swings would be catastrophic to corals. Further, alkalinity is important to the calcification of corals. The ideal range for alkalinity in reef aquariums is between 125-200ppm of calcium carbonate (7-11 dKH). Many test kits are available on the market that rely on a color change that needs to be judged by eye. The HI772 from Hanna makes alkalinity testing easy by simply mixing the sample with reagent and pressing a button.
How it works:
The Hanna Marine Alkalinity (dKH) Checker® HC - HI772 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.
Fill the cuvette to the 10mL line with sample and fasten the cap.
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", extract 1mL of reagent from the reagent bottle with the syringe and add to cuvette. Once the reagent has been added, cap the cuvette and invert five times to mix.
Wipe the cuvette of any oils and fingerprints, and place back into the meter. Press the button, and the meter will display the alkalinity in degrees Karbonathärte (dKH).
Features:
Result in dKH - no conversion needed!
Compact, portable design
Built-in timer
One button operation
Easier to use and more accurate than chemical test kits
Dedicated to a single parameter
Small size, big convenience
Ideal for: Aquaculture & Aquariums, Water Quality
Specifications:
Range: 0.0 to 20.0 dKH
Resolution: 0.1 dKH
Accuracy @ 25°C/77°F: ±0.3 dKH ±5% of reading
Light Source: LED @ 610 nm
Light Detector: silicon photocell
Method: colorimetric method
Environment: 0 to 50°C (32 to 122°F); RH max 95% non-condensing
Battery Type: (1) 1.5V AAA
Auto-off: after ten minutes of non-use
Dimensions: 86.0 mm x 61.0 mm x 37.5 mm (3.4" x 2.4" x 1.5")
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.
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9 Questions
Displaying questions 1-9
Q
Hanna Instruments Checker is there a tester for Nitrate?
Asked : Apr 08, 2020
By : Gunther Winkler, Alsip,Ill
There are two alkalinity checkers, one has to be converted manually, the other shows doh natively.
Answered : Nov 04, 2019
By : Eric, Salt Lake City
A
theres no way to change it on the checker as you have the ppm not dkh checker
Answered : Apr 12, 2019
By : jimmy
A
I have the ppm alkalinity tester. the directions tell you .056 x the reading given (Example .056 x 157 ppm =8.792 )
Answered : Feb 16, 2018
By : jim Volk, United States
A
It sounds like you may have the Hanna Instruments Marine Colorimeter (PPM). For this checker you would have to convert to dKH from PPM. Please use this formula provided by Hanna to convert your results: In order to convert to DKH: ppm / 50 x 2.8 = KH.
This is the best checker I've purchased. To me its the best checker to buy when starting out. Very easy to preform the test with digital readout. I test every other day to make sure my dosing pump is still running correctly and the tank isn't using up more than needed.
Unit was 3.o higher than a Redsea test I ran on the same water. Indicat my water was 6.0 in a tank that has amazing growth. Cant trust these checks. Bough A Calcium and it had error codes to start off. Returning them for refunds! I'll stick with my RED SEA kits!
PROS
Easy to use. Easy to read display. No guessing.
CONS
NONE
REVIEW
This hobby/lab grade tester is always spot on. I often test twice just to make sure I am getting consistent results, and the results are almost always the exact same!
Most orders under $39 ship for only $5.99 using a mix of economy shipping methods including UPS Ground, USPS First Class, and/or SurePost. Your order will be delivered in up to 7 business days after it ships out.
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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 up to 7 business days. Just spend $39 or more!
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