Saltwater Nitrate Low Range Checker® HC$59.95
The HI781 Marine Nitrate Low Range Colorimeter is designed to accurately determine low range nitrate levels in saltwater aquariums and marine applications. With a digital read out, there is no more struggling to determine colors visually.
- Range: 0.00 to 5.00 ppm (as NO3–) [0.0 to 50.0 ppm (calculated) using dilution]
- Built-in timer so you don't miss a step.
- Saltwater Compatible
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The HI781 Checker®HC (Handheld Colorimeter) is a simple, accurate, and cost-effective way to measure nitrate from 0.00 to 5.00 ppm (as NO3–) in your saltwater aquarium. For samples containing 5.0 to 50.0 ppm nitrate, follow the approved dilution procedure.
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 color and paleness.
The HI781 Nitrate Checker HC is a handheld colorimeter that uses the Beer-Lambert principle to determine the concentration of nitrate colorimetrically. The HI781 is designed specifically to measure low levels of nitrate in a saltwater aquarium.
- For use with saltwater samples.
- More accurate than chemical test kits.
- Dedicated to a single parameter.
- Small size, big convenience.
- No errors with a digital readout.
- Ideal for aquariums and marine biology applications.
- For samples containing 5-50 ppm nitrate, follow the dilution procedure.
See What Others are Saying
Never Going Back
Extra Step not a problem for me. More important to get an accurate reading. Have had problems in the past with standard nitrate test kits being wrong. I am never going back.
Once you get the steps down it’s pretty easy. I love this and I am so glad I have some thing that gives me an accurate measurement.
Lots of steps, but more accurate than guessing colors.
This removes the guessing game and gives a much more precise number.
HI781 Instructional Video
In the following video, we will walk you through the entire procedure to test your nitrate levels from 0.00 to 5.00 ppm. For samples containing between 5 - 50 ppm, follow the instructions for the dilution measurement procedure.
HI781 Instructional Video with Dilution
The following video describes the procedure of measuring dilution volumes using the Hanna HI781 Marine Nitrate Checker for samples containing 5-50 ppm nitrate. Make sure to use RO/DI water and quality artificial aquarium salts to mix the nitrate/nitrite free artificial seawater diluent for this test.
From The Expert: Q&A
Specification Name Detail SKU HI781 Range 0.00 to 5.00 ppm (as NO3–)
0.0 to 50.0 ppm (calculated) using dilution
Resolution 0.01 ppm Accuracy @ 25°C/77°F ±0.25 ppm ±2% of reading @ 25 °C (77 °F)
±2.5 ppm ± 5% of calculated reading using dilution
Light Source LED @ 525 nm Light Detector silicon photocell Method Colorimetric method. The reaction between nitrate and the reagent causes a pink/violet tint in the sample. This checker has been developed to work with seawater samples. Battery Type (1) 1.5V AAA Auto-off after ten minutes of non-use Environment 0 to 50°C (32 to 122°F); RH max 95% non-condensing Dimensions 86.0 x 61.0 x 37.5 mm (3.4 x 2.4 x 1.5”) Weight 64 g (2.3 oz) Ordering Information Each HI781 is delivered in a case with custom insert and is supplied with: Marine Nitrate Low Range reagent starter kit (reagents for 25 tests), Sample cuvette and cap (2 pcs.), Filter paper (25 pcs.), Filter holder (1 pc.), Mixing vial and cap (1 pc.), 5 mL syringe with tip (1 pc.), 10 mL syringe (1 pc.), 1 mL graduated syringe (1 pc.), Plastic refilling pipette (1 pc.), 16 gauge blunt needle (1 pc.), 1.5V AAA Alkaline battery (1 pc.), and Instruction manual. Reagent Set HI781-25 (25 tests) Calibration Set HI781-11 Warranty 1 year