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HI780 Marine pH Checker HC Handheld Colorimeter - Hanna Instruments


Item #: HN78000

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HI780 Marine pH Checker HC Handheld Colorimeter - Hanna Instruments

The HI780 pH Checker HC by Hanna Instruments is a simple, accurate, and cost effective way to measure pH in seawater. Designed as a more convenient alternative to chemical test kits, this handheld colorimeter provides quick, accurate pH testing results.

Why are pH levels important?
pH levels affect marine life growth, reproduction, and communication. In the context of corals, incorrect pH levels can inhibit skeleton building and limit overall growth.

  • Great for saltwater aquariums and marine environmental testing
  • Easier to use and more accurate than chemical test kits
  • Dedicated to a single parameter
  • Simple one-button operation
  • Digital read out for added convenience
  • Compact size for easy travel and storage


Range 6.3 to 8.6 pH
Resolution 0.1 pH
Accuracy @ 25°C/77°F ±0.2 pH
Light Source LED @525 nm
Light Detector Silicon photocell
Method Colorimetric adaptation of phenol red 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
What`s Included:
  • (1x) HI780 Checker HC
  • (2x) Sample cuvettes with caps
  • (1x) pH Reagent starter set
  • (1x) 1.5V AAA battery
  • (1x) Instructions

Accessories (sold separately):

Manufacturer information

Hanna Instruments USA Aquarium Supplies
Hanna Instruments is a leading manufacturer of analytical aquarium instrumentation. They were founded in 1978 and are headquartered in Woonsocket, Rhode Island. When Hanna introduced pH Electronic Paper in 1986 it literally revolutionized the world of testing by allowing millions of people in various industries to test for pH in a simple, accurate and affordable way. Hanna employees are constantly challenging themselves to improve on existing technology and to invent new testing techniques with the common goal to simplify analytical testing. This applies not only to instrumentation, but also to sensors development, reagents and chemicals. Hanna also believes in controlling the quality of their products from inception to delivery so they manufacture everything themselves, from meters and electrodes to chemical reagents and buffer solutions.

5 Stars


Reviewed on
December 25, 2020

Yes, I would recommend this.

HI780 Marine pH Checker HC Handheld Colorimeter - Hanna Instruments

love it works good

Was this review helpful? 0 0


Reviewed on
September 13, 2020

Yes, I would recommend this.

Yes, Love this checker

no more color matching when checking my PH. perfect slide the cuvet in and get your reading. so simple and accurate.

Was this review helpful? 3 0


Reviewed on
August 26, 2020

Yes, I would recommend this.

PH Checker

Nice, easy to use

Was this review helpful? 2 0


Reviewed on
August 21, 2020

Yes, I would recommend this.

Hanna is the best!

Pros: Simple, easy and accurate

Cons: Cost.

Finally a simple easy way to KNOW what your pH number is. No color charts with in between readings. Finally!!

Was this review helpful? 1 0


Reviewed on
August 13, 2020

Yes, I would recommend this.

Great 👍

I have several test kits and this is “the one”. So easy and has given me accurate readings every time. Two Thumbs Up...

Was this review helpful? 3 0

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