Hanna HI772 Alkalinity dKH Colorimeter Marine Checker

Hanna HI772 Alkalinity dKH Colorimeter Marine Checker

Hanna HI772 Alkalinity dKH Colorimeter Marine Checker is a compact, pocket-sized colorimeter that measures alkalinity in dKH in marine aquariums. It is designed for South African reef keepers and saltwater hobbyists who want electronic readings they can repeat, rather than trying to judge a colour change by eye. Hanna has updated this Checker to report in dKH, the alkalinity unit most commonly used in the aquarium hobby, so there is no conversion to do.

Alkalinity is one of the parameters marine aquarists test most often. The HI772 sits between simple chemical test kits and professional laboratory instruments. It gives you accurate, dependable readings in a handheld unit that is easy to use. Results appear on a large LCD display that is easy to read, even in a dim fish room or cabinet. Replacement reagents can be bought separately as needed, so the Checker keeps working long after the first bottle runs out.

Key Benefits

• Reads directly in dKH: Results appear in the unit reef keepers use day to day, so you can compare them with your targets and dosing records straight away.
• More reliable than chemical test kits: Chemical and titration kits have limited accuracy and are hard to repeat. They usually depend on the human eye and the room lighting to decide the result. The HI772 removes that guesswork.
• Repeatable results: A single light source at a fixed wavelength lets the Checker take repeatable measurements time after time. This makes it easier to spot real trends in your tank's alkalinity.
• Laboratory-style method: Laboratories and large-scale testing facilities use similar colorimetric devices because their measurements are dependable and precise.
• Dedicated to a single parameter: Hanna does not build one unit to test everything. Each Checker is designed for one parameter, which gives the test greater precision and makes the device simpler to use.
• Large LCD display: The digital readout is easy to read at a glance.
• Small size, big convenience: At around 65 g (2.3 oz), the Checker fits easily in the palm of your hand or in a pocket, ready for quick, accurate on-the-spot tests.
• Single-button operation: One button handles both zeroing and measuring.
• Battery powered: It runs on a single AAA battery, with auto-off to save power.
• Refillable reagents: It uses Hanna HI772-26 liquid reagents, which you can buy as replacements when you need them.

How to Use

Getting a result takes three simple steps:

• Step 1, zero: Fill a clean cuvette with your aquarium water sample and zero the instrument.
• Step 2, add reagent: Add the HI772-26 alkalinity reagent to the sample.
• Step 3, measure: Place the vial into the Checker, press the button and read the dKH result on the display.

Important: Keep the vials clean. This is essential with all Hanna Checkers and is key to consistent, dependable results. Read the included instructions and quick start guide before your first test.

Suitable For

• Marine reef aquariums where alkalinity (dKH) is monitored regularly
• Saltwater hobbyists moving up from chemical or titration test kits to electronic testing
• Aquarists who want repeatable readings to track alkalinity trends over time
• Quick on-the-spot checks at the tank, in the fish room or on the go

Compatibility

The HI772 Checker is designed for Hanna HI772-26 liquid alkalinity reagents. Its operating range of 0 to 50°C (32 to 122°F) and maximum relative humidity of 95% (non-condensing) comfortably cover typical South African fish rooms and living spaces.

Specifications

• Parameter: Alkalinity (marine), reported in dKH
• Range: 0.0 to 20.0 dKH
• Resolution: 0.1 dKH
• Precision: ±0.3 dKH ±5% of reading
• Method: Colorimetric method
• 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 a reading
• Dimensions: 81.5 x 61 x 37.5 mm (3.2 x 2.4 x 1.5")
• Weight: 64 g (2.25 oz)
• Reagent: Hanna HI772-26 liquid reagents

What's Included

• HI772 Checker
• 2 sample cuvettes with caps
• 1 bottle of alkalinity reagent HI772-26
• 1 ml syringe and tip
• Battery
• Instructions
• Quick start guide

Frequently Asked Questions

What alkalinity range can the Hanna HI772 measure?
It measures from 0.0 to 20.0 dKH, with a resolution of 0.1 dKH and a precision of ±0.3 dKH ±5% of reading.

Why choose an electronic Checker over a drop-test alkalinity kit?
Chemical and titration kits rely on your eye and the room lighting to read a colour change, which limits accuracy and makes results hard to repeat. The HI772 uses a single LED light source at a fixed 610 nm wavelength and a silicon photocell, so its readings are repeatable from test to test.

Which reagent does the HI772 use, and can I get refills?
It uses Hanna HI772-26 liquid reagents. One bottle comes in the box, and replacement reagents can be bought separately when you need them.

What power does the Checker need?
It runs on one 1.5V AAA battery, and a battery is included. To save power, the unit switches off automatically after 10 minutes of non-use and after a reading.

How do I keep my readings consistent?
Keep the cuvettes clean, as this is essential for consistent, dependable results with Hanna Checkers. Always zero the instrument with your own water sample before adding the reagent.

Can I return the HI772 if it is not right for me?
No. Because of the nature of this test kit, returns cannot be accepted. Please take the time to read about the Checker thoroughly and familiarise yourself with how it works before purchasing.

When can I expect delivery?

• Gauteng (Jhb/Pta) - 1-3 working days
• Nationwide (Cpt/Dbn+) - 2-5 working days
• Outlying Areas - 3-7 working days

All orders are sent via Economy Road, typically through Fastway or Internet Express Couriers*. Estimated timeframes are not guaranteed. Once the order is collected by the courier, we have no control over third-party logistics and cannot make any time promises.

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