Marine pH Checker® HC – HI780

Get accurate water testing results with the HI780 Marine pH Colorimeter. With a digital readout, there is no more struggling to determine colours visually. This pH tester’s compact design fits in your pocket or stores easily in your shop.



  • Easier to use and more accurate than chemical test kits.
  • One-button operation makes getting your pH results simple.
  • Great for aquariums and marine environmental testing.



Join the waitlist to be emailed when this product becomes available


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 readout for added convenience
  • Compact size for easy travel and storage




Range6.3 to 8.6 pH
Resolution0.1 pH
Accuracy @ 25°C/77°F±0.2 pH
Light SourceLED @525 nm
Light DetectorSilicon photocell
MethodColorimetric adaptation of phenol red method
Auto-offAfter ten minutes of non-use
Environment0 to 50°C (32 to 122°F); RH max 95% non-condensing
Battery Type(1) 1.5V AAA

Additional information

Weight.35 kg
Dimensions19.5 × 12.5 × 6.5 cm