Hanna Instruments

Marine pH Colorimeter HI780 Hanna Checker

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The HI780 Marine pH Checker HC is a simple, accurate and cost effective way to measure pH in saltwater. With a digital readout, there is no more struggling to determine colors visually. This pH tester's compact design stores easily with your other testing equipment. Keeping your aquarium pH stable and in optimal range can reduce stress on your fish and aquatic animals, helping them resist disease and tolerate other stressors. Maintaining an ideal pH can also dramatically improve growth, behavior, and overall appearance of corals. 


Designed as a more accurate alternative to chemical test kits, the HI780 marine pH meter provides quick, accurate results in a few easy steps.



  • Easier to use and more accurate than chemical test kits
  • Large, easy to read digits Auto shut-off
  • Dedicated to a single parameter
  • Designed to work with HANNA's reagents
  • Uses 10 mL glass cuvettes
  • Small Size, Big Convenience
  • Fits in the palm of your hand
  • One-button operation makes getting your pH results simple.



  • Range: 6.3 to 8.6 pH
  • Resolution: 0.1 pH
  • Accuracy: ±.2 pH of reading @ 77°F
  • Light Source: LED @ 525 nm
  • Light Detector: Silicon photocell
  • Method: Colorimetric Adaptation of Phenol Red Method
  • Environment: 0 to 50°C (32 to 122°F); RH max 95% non-condensing
  • Battery Type: (1) 1.5V AAA
  • Auto-off: After 10 minutes of non-use
  • Dimensions: 86 x 61 x 37.5 mm (3.4 x 2.4 x 1.5")
  • Weight: 64 g (2.25 oz.)
  • Checker Reagents: Hanna HI780-25 (100 tests)
  • Calibration Check Set: HI780-11


What's Included

  • HI780 Checker
  • 2 sample cuvettes with caps
  • pH Reagent starter set
  • battery
  • instructions
  • 1 year limited warranty


Reagent Refills - HI780-25 (100 tests)

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Product Questions

Any chance this will work with freshwater?
Question by: Eric Benton on Nov 26, 2021, 7:50 AM
Unfortunately, this will not work for freshwater.
Answer by: Matt Lucero (BRS Staff) on Nov 27, 2021, 12:16 PM