The HI782 Marine Nitrate High Range HC is specifically designed to quickly and accurately determine high levels of nitrate for saltwater aquariums and marine applications. With a digital read out, there is no more struggling to determine colors visually.
Nitrate is the final step in the Nitrogen cycle. Excessive amounts of nitrates in saltwater aquariums facilitate the growth of undesirable organisms such as algae and dinoflagellates. The HI782 is a simple, accurate, and cost-effective way to measure nitrate from 0.0 to 75.0 ppm (as NO3–) in your saltwater aquarium.
The HI782 Nitrate Checker HC uses the Zinc Reduction method to measure the concentration of nitrate colorimetrically. The HI782 provides quick, accurate results in four easy steps.
Sepcifications:
Range : 0.0 to 75.0 ppm NO3-
Resolution : 0.1 ppm
Accuracy @ 25°C : ± 2.0 ppm ±5/ of reading @25°C 
Light Source : LED @ 610nm
Light Detector : silicon photocell
Battery Type : (1) 1.5V AAA
Auto-off : after 10 minutes of non-use
Environment : 0 to 50°C ; RH max 95% non-condensing
Dimensions : 86.0 x 61.0 x 37.5 mm
Weight : 64 g
Calibration Set : HI782-11 Not included
Warranty : 1 year
What's inculded
1x HI782 Checker®HC 
2x sample cuvettes with caps
1x HI782-25 reagent (10 tests)
3 mL pasteur pipette
1x batteries
1x instructions, and quick start guide.