HI781 Saltwater Nitrate Low Range Checker
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Get highly accurate results with the HI781 Marine Nitrate Low Range Colorimeter. With a digital read out, there is no more struggling to determine colors visually. This nitrate tester's compact design fits in your pocket or stores easily in your shop.
- Easier to use and more accurate than chemical test kits.
- One-button operation makes getting your nitrate results simple.
- Great for saltwater aquariums.
The HI781 Checker®HC (Handheld Colorimeter) is a simple, accurate, and cost-effective way to measure nitrate in your saltwater aquarium.
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.
Features at-a-glance:
- 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.
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.
| 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 |