Marine Low Range Nitrate Checker HC – HI781

ل.س 450,000.0

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 saltwater, reef aquarium maintenance. Like professional instrumentation that use a light source, filter, and light sensing detector, the Hanna Marine Nitrate Checker® uses a fixed wavelength LED and silicon photo detector to provide the accuracy of professional instrumentation at the affordable price of a chemical test kit.
  • Compact, Portable Design
  • Built-in Timer
  • Saltwater Compatible
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:
How to use Hanna Checker Handheld Colorimeter


More accurate and easier to use than chemical test kits
Small size, big convenience
Ideal for aquariums and marine biology
Dedicated to a single parameter

HI782 High Range Nitrate Checker vs HI781 Low Range Nitrate Checker

The HI782 was designed to quickly and easily measure nitrate levels for aquarist with higher-than-average nutrient levels. This includes saltwater aquariums that are fish-only or have corals that can tolerate elevated levels of nitrate at 30 ppm or more. Very low levels of nitrate are critical for many saltwater reef aquariums, as nitrate can cause damage and possible death to certain delicate corals and invertebrates. For this reason, the HI781 offers unmatched precision in the measurement of very low levels of nitrate (0.00 to 5.00 ppm). For freshwater samples, Hanna Instruments recommends using the HI97728 Nitrate Portable Photometer.
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
0 to 50 °C (32 to 122 °F); max. 95% RH non-condensing
64 g (2.3 oz)
86.0 x 61.0 x 37.5 mm (3.4 x 2.4 x 1.5”)
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.
Nitrite and Copper present will interfere with the measurement.


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