Hanna Instruments HI-781 Marine Nitrate Low Range Handheld Colorimeter, Checker HC
The HI-781 Nitrate Checker HC is a handheld colorimeter that uses the Beer-Lambert principle to determine the concentration of nitrate colorimetrically.
The HI-781 is designed specifically to measure low levels of nitrate in a saltwater aquarium. The 0.00 to 5.00 range is ideal for reef aquarium maintenance
Nitrate is a by-product of the Nitrogen cycle. Excessive amounts of Nitrates in a reef aquarium can promote the growth of undesirable organisms including algae and dinoflagellates, while insufficient amounts can lead to starvation in which SPS, and other corals, will show signs including the loss of colour and paleness.
Ideal for aquariums and marine biology
Easier to use and more accurate than chemical test kits
Small size, big convenience
The Checker®HC handheld colorimeter is supplied with:
Sample cuvette and cap (2)
Marine Nitrate Low Range reagent starter kit (reagents for 25 tests)
Filter paper (25)
Filter holder (1)
Mixing vial and cap (1)
5 mL syringe with tip (1)
10 mL syringe with tip (1)
1.5V AAA Alkaline battery (1)
Instruction manual
Specifications
Range:0.00 to 5.00 ppm (mg/L) NO-
Resolution: 0.01 ppm
Accuracy @ 25°C/77°F: ±0.25 ppm ±2% of reading
Light Source: LED @ 525 nm
Light Detector: silicon photocell
Method: zinc reduction method
Auto-off: after ten minutes of non-use
Environment: 0 to 50°C (32 to 122°F); RH max 95% non-condensing
Battery Type: (1) 1.5V AAA
Ordering Information: HI781 Checker HC is supplied with sample cuvettes with caps (2), nitrate reagent starter kit (reagents for 25 tests), filter holder, 10 mL syringe, 5 mL syringe with tip, mixing vial with cap, battery, and instructions.
Accessories: HI781-25 Reagent set for 25 tests, HI781-11 Calibration set
Sku: HI-781
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.