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. The 0.00 to 5.00 ppm (mg/L) range is ideal for reef aquarium maintenance.

Designed as a more accurate alternative to chemical test kits, the HI781 provides quick, accurate results in four easy steps:

Features at-a-glance:

• Easier to use and more accurate than chemical test kits
• Small size, big convenience
• Ideal for aquariums and marine biology

• More Information

  Nitrate Range	0.00 to 5.00 ppm (as NO3–)
  Nitrate Resolution	0.01 ppm
  Nitrate Accuracy	±0.25 ppm ±2% of reading @ 25 °C (77 °F)
  Nitrate 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.
  Photometer/Colorimeter Light Source	Light Emitting Diode @ 525 nm
  Photometer/Colorimeter Light Detector	Silicon photocell
  Battery Type/Life	1.5V AAA Alkaline
  Automatic Shut-Off	After 10 minutes of non-use
  Environment	0 to 50 °C (32 to 122 °F); max. 95% RH non-condensing
  Weight	64 g (2.3 oz)
  Dimensions	86.0 x 61.0 x 37.5 mm (3.4 x 2.4 x 1.5”)