Hanna Instruments-755 Seawater/Marine Alkalinity Colorimeter - Checker®HC
Ideal for salt water aquariums and coral reef tanks.
Designed exclusively for saltwater aquariums, the Hanna Instruments-755 offers a quick, easy and highly accurate method of checking Alkalinity.
Checker®HC is supplied with reagents for 25 tests. Use code Hanna Instruments-755-26 for future purchases.
Ideal for salt water aquariums and coral reef tanks.
Designed exclusively for saltwater aquariums, the Hanna Instruments-755 offers a quick, easy and highly accurate method of checking Alkalinity.
Alkalinity helps to maintain a stable pH, a vital factor for most aquatic life. Corals also need an adequate level of alkalinity in order to support healthy growth: if levels are too low, corals cannot precipitate and form their skeletons; if levels fluctuate too much or too quickly, growth can become impaired.
The more precise and stable the levels, the better the results. With regular, precise monitoring, fluctuations in levels can be quickly corrected, giving your corals the best chance of success.
Ideal for:
- Salt water aquariums
- Coral reef tanks
Main Benefits
- Testing is quick and easy
- High precision results - more accurate than chemical test kits
- Auto shut-off feature means the Checker cannot be left on by mistake
- Fully portable, fitting easily into both palm and pocket
Supplied with
- 2 sample cuvettes
- Cuvette cap
- Starter pack of reagents (Hanna Instruments-755-26)
- 1 x 1.5 AAA battery
- Instructions
Also available: Hanna Instruments-755-11 Calibration Set
Frequently Asked Questions
Clear answers to help you choose the right water testing solution with confidence
Which brands of water testing kits do you supply?
Do you provide kits for both home and professional use?
Yes — whether you’re a pool or spa owner, aquarium keeper, utility company, or a university laboratory, we have the right solution for your needs.
Can I arrange servicing or calibration for my photometer?
Absolutely. We also provide servicing and calibration to keep your photometers accurate and reliable.
How quickly do you dispatch orders?
Orders placed before 2:30 pm (Monday–Friday) are dispatched the same day. We also ship on Saturdays for your convenience.
Which couriers do you use for delivery?
We deliver through UPS, DPD, and Royal Mail. You can also choose to upgrade to next-day delivery at checkout.
What is your return policy?
We accept returns within 14 days of delivery provided the items are unused, in their original packaging, and in resalable condition. Please contact our team before returning any items.
Can I place bulk or business orders?
Yes, we welcome bulk, trade, and institutional orders. For tailored pricing or large quantities, please get in touch with us directly.
How can I get help if I’m unsure which kit to buy?
You can call us at 📞 +44 (0)115888 2726 and our team will guide you in choosing the most suitable kit for your needs.