Take the guesswork out of aquarium testing
Hanna Checkers are easy-to-use, incredibly accurate testers that help you get your aquarium parameters on track. Throw out the test strips and go digital with a simple, palm-sized tester that does all the work for you. Simply take a sample, add the reagent included in your starter kit, and get your reading.
The Checker range covers all key parameters for freshwater and marine fish tank testing, from common requirements like nitrate and ammonia to niche testing for phosphate, iron and chlorine. Browse the range now to discover measurements that’s as easy as 1-2-3-4.
HSG282: The Facts
1. Compliance isn’t legally required, but highly recommended
While you don’t legally need to comply with HSG282, it’s highly recommended that you do to meet the requirements of the Health & Safety at Work Act 1974 to maintain best practice.
2. pH testing is a vital part of meeting HSG282 guidelines
Measuring pH twice-daily ensures the water in your hot tub or spa pool is within specific parameters, maintaining the right standard of sanitation to protect against sickness.
3. Protecting you, your business and customers from risk
Compliance keeps you, your staff and your customers safe from a range of serious diseases and infections, including Legionnaires’ disease, staph infections and giardiasis.
4. The right testing equipment helps you achieve compliance
A high-quality pH tester is vital to achieve compliance with HSG282, ensuring you’re able to complete accurate, reliable measurements twice a day, every single day for your records.
Four Simple Steps to Test
1. ‘Zero’ the Checker with your vial & 10 ml water sample inside2. Take your vial out and add your reagent
3. Place your vial into your Checker
4. Press the button and read the results
Why go digital for your aquarium?
A digital tester is the ideal option for your aquarium, whether you have a 175-gallon coral aquascape hosting dozens of species or a 10-gallon tank for your beta. Testing strips rely on your own visual perception of results, which can lead to over or under-dosing your water. For optimal tank and fish health, you want a solution that’s accurate, simple and digital.
- Incredibly accurate
- Clear digital testing results
- A wide range of parameters
- Simple single-button operation
- Waterproof casing
- Starter reagents included
- Reliable testing for years after purchase

Check out the entire range
We have checkers for all of your aquarium testing needs covering a wide variety of parameters. Here you can find all Marine Checkers, followed by Marine & Freshwater Checkers and then Checkers specifically for freshwater aquariums. Or if you need more information keep scrolling to see our latest aquarium articles!
Marine Checkers
Marine & Freshwater Checkers
Freshwater Checkers
FAQs
What’s the difference between testing strips and Hanna Checkers?
Accuracy is the key difference between testing strips vs Checkers. Test strips require you to use your personal perception to determine the results of testing from a colour chart or wheel, while Checkers do all the work for you, providing a clear, accurate digital readout on the screen.
What parameters are covered by Hanna Checkers?
Hanna Checkers cover a wide range of aquarium parameters across marine and freshwater tanks, including ammonia, chlorine, calcium, nitrate, nitrite and phosphate. For a full list of parameters, see our Checker range above or visit our website here.
Can I use one Checker for multiple aquariums?
Checkers can be used for as many aquariums as you like - the only limitation is the number of reagents you have for testing. Once you get through your free reagents with your Checker purchase, you can buy additional reagent sets directly from Hanna Instruments to ensure you always have the stock you need.
Where can I buy reagents for Hanna Checkers?
We stock reagents right here at Hanna Instruments UK. We maintain local stock and offer next-day delivery so you’re never short on reagents when you need them the most. Our reagents are designed to have a long shelf life and are well-packaged, ensuring accurate results on every single test.
How accurate are Hanna Checkers?
Hanna Checkers are exceptionally accurate, providing clear digital results from testing. Our popular HI-715 Medium Range Ammonia Checker, for example, has an accuracy of 0.05 ppm or ±5% of reading, providing far more precise readings than you’d be able to achieve through the use of test strips and colour perception.
Can Hanna Checkers help improve my aquarium water chemistry?
Accurate measurement is a key part of keeping your aquarium and fish healthy. Digital readings provide an exact level of each parameter in your fish tank, which makes dosing your water and managing your filtration easier. Checkers make testing quick and easy, which also means you’ll be able to respond to problems in aquarium chemistry swiftly if you’re measuring more often.
Can you recommend Hanna Checkers for my aquarium?
Unsure which Hanna Checkers are the right fit for your requirements? Speak to our experts directly and we’ll advise you on the ideal products to get started. We stock Checkers covering both marine and freshwater tanks with a wide range of parameters, available at our UK facility and ready to ship to your door.