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Hanna Instruments – HI781 Marine Low Range Nitrate Checker HC

The HI781 Marine Low Range Nitrate Checker HC is a portable colorimeter designed to measure ultra-low nitrate levels in saltwater reef aquariums. Using the Beer-Lambert principle, it delivers precise digital results in the critical range of 0.00 to 5.00 ppm (NO₃⁻). Ideal for sensitive corals and SPS systems, it helps prevent algae overgrowth and coral starvation caused by improper nitrate levels. Compact and easy to use, it provides laboratory-style accuracy in just four simple steps.

  • Ultra-Low Range: 0.00–5.00 ppm (Ideal for Reef Tanks)
  • More Accurate Than Chemical Test Kits
  • Digital Colorimetric Measurement (525 nm LED)
  • Compact, Portable & Easy 4-Step Testing

Description

Maintaining proper nitrate levels is critical in reef aquariums. Excess nitrate can promote unwanted algae and dinoflagellates, while levels that are too low may cause coral paling and nutrient starvation. The HI781 is specifically engineered for low-level nitrate detection in marine systems, offering superior precision compared to traditional visual test kits. Its narrow range of 0.00 to 5.00 ppm makes it perfect for reef aquariums where even small nitrate fluctuations matter.

The checker operates using a colorimetric reaction that produces a pink/violet tint, measured by a 525 nm LED light source and silicon photocell detector. Designed exclusively for seawater testing, it ensures reliable and repeatable results. For higher nitrate levels (up to 50 ppm), aquarists may consider the HI782 High Range model, while freshwater users are advised to use the HI97728 photometer.

Features

  • Nitrate Range: 0.00 to 5.00 ppm (as NO3–)
  • High Resolution: 0.01 ppm
  • Accuracy: ±0.25 ppm ±2% of reading @ 25°C
  • Measurement Method: Colorimetric (Beer-Lambert principle)
  • Light Source: LED @ 525 nm
  • Light Detector: Silicon photocell
  • Designed for Saltwater Aquariums – Ideal for reef tanks and marine biology
  • More Accurate Than Chemical Test Kits – Eliminates color comparison guesswork
  • Automatic Shut-Off: After 10 minutes of non-use
  • Compact & Lightweight: 86 x 61 x 37.5 mm; 64 g
  • Battery Type: 1.5V AAA Alkaline
  • Supplied With: 2 cuvettes with caps, nitrate reagents (25 tests), syringes, mixing vial, battery, instructions
  • Important Note: Nitrite and copper may interfere with measurement

Specifications

SKU HI781
Product Name Marine Low Range Nitrate Checker HC – HI781
Quote Required Yes
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”)
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.
Notes Nitrite and Copper present will interfere with the measurement.

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