Saltwater Nitrate Low Range Checker® HC – HI781

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.

  Specifications:

  Specifications	HI781
  Range	0.00 to 5.00 ppm (mg/L) NO₃-
  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