Ammonia High Range Checker HC


Simple, accurate, and cost effective way to measure high ranges of ammonia in fresh water!


The HI 733 High Range Ammonia Checker HC (Handheld Colorimeter) is a simple, accurate, and cost effective way to measure high ranges of ammonia in freshwater.

Designed as a more accurate alternative to chemical test kits, the HI 733 provides quick, accurate results in four easy steps.

  1. Step One – Add 1ml of sample and 9ml of reagent “B” to the included cuvette.
  2. Step Two – Insert sample into the Checker and zero it out
  3. Step Three – Remove sample and add reagent “A”
  4. Step Four – Reinsert sample and click the button to measure your results or…- Press and hold the button for 3 seconds for a time reaction reading


The HI 733 uses an adaptation of the ASTM Manual of water and Environmental Technology D1426-92, Nessler Method. The reaction between ammonia and reagents causes a yellow tint in the sample.


  • Small palm-sized design
  • Accurate from ±1.0ppm ± 5% of reading
  • Dedicated to a single parameter
  • Uses a single AAA battery
  • Auto Power Off after 10 minutes in inactivity
  • Built-in timer for timed reaction readings


  • Water Quality
  • Education
  • Freshwater Aquariums
  • Wastewater
  • Environmental

Includes:The HI 733 Checker®HC is supplied with 2 cuvettes and caps, reagent starter kit (1bottle of HI 733A-0 and 1 bottle of HI 733B-0), 1 x1.5V AAA battery, and an instruction manual

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