Hanna Instruments

Marine Master HI97105 Multiparameter Photometer

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Discontinued by Bulk Reef Supply
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Accurately check pH, Alkalinity, Calcium, Low Range and High Range Nitrate, Ultra Low Range Nitrite, and Ultra Low Range Phosphate with one single, compact multiparameter tester!


All-In-One Testing with Precise Results for Reef Tanks
The HI97105 Marine Master Photometer is a waterproof tester that combines accuracy and ease of use into one simple, portable design. Its advanced, lab-quality optical system ensures accurate readings while its user-friendly design and built-in tutorials make it perfect for marine scientists and aquarium hobbyists alike.

  • Precise and advanced LED optical system
  • No warm up time needed before taking a measurement
  • Waterproof and floating IP67 meter design
  • CAL Check validation and calibration
  • Consolidates testing needs into one unit
  • Includes auto-data logging features to easily record water testing results
  • On-screen tutorial mode guides users step-by-step through the measurement process
  • Option to select measurement location for better tracking consistency
  • Auto shut-off
  • Rugged carrying case included


Precise Laboratory Testing, Simplified
The Marine Master Photometer comes equipped with user-friendly on-screen tutorials and animations to help guide you through every step of setup, calibration, and testing. You can easily access this Tutorial Mode at any stage of the setup or measurement process by tapping the dedicated Help key.

Smart Energy Use
When the battery level is below 10%, a warning symbol will blink to indicate low battery condition. When low battery power may affect your results, the meter will shut down to avoid erroneous readings caused by low battery level. In order to preserve battery life, the Marine Master has an Auto-Off feature that will automatically power down the device after 15 minutes of inactivity.


Auto Data Logging
The Marine Master will automatically log your results, so there is no need to worry if you’ve missed recording a measurement. The last 50 measurements can be instantly viewed using the Log Recall Menu.


CAL Check Validation
Hanna’s exclusive CAL Check feature provides a stress-free, straightforward way to ensure your photometer is working properly. Simply insert the certified CAL Check standards and let your meter guide you through validation. If your photometer is out of specification for any reason, simply calibrate to your standard.


Advanced Optical System
The Marine Master has an advanced optical system that uses a Light Emitting Diode (LED) and a narrow band interference filter that allows for accurate and repeatable readings. The internal reference system of the photometer compensates for any drifts due to power fluctuations or ambient temperature changes, providing a stable source of light for the blank (zero) measurement and sample measurement. Improved optical filters ensure greater wavelength accuracy and allow a brighter, stronger signal to be received. A focusing lens collects all of the light that exits the cuvette, eliminating errors from cuvette imperfections and scratches. The end result is highly reliable lab-grade readings in the palm of your hand.


Durable & Portable Design
Designed to withstand the knocks, drops, and spills of real life, the new IP67 body ensures top performance in any environment. Internal optics are sealed from outside dust, dirt, and water. The meter also floats, so you can easily retrieve it if you drop it in water. This photometer uses an exclusive positive‑locking system to ensure that the cuvettes are placed into the holder in the same position for accurate readings every time.

The Marine Master also fits comfortably in your hand for on-the-go testing. The supplied AA batteries provide life for more than 800 measurements, and its backlit LCD display can provide readings from any angle, day or night. Everything you need for testing comes neatly stored in the provided durable carrying-case for added convenience.


What’s Included?
1x HI97105C Photometer
1x HI780-25 Marine pH reagent (30mL)
1x HI772-26 Marine Alkalinity reagent (30mL)
1x HI7581U Marine Calcium reagent A (30mL)
1x HI7582 Marine Calcium reagent B starter kit (reagent for 25 tests)
1x HI782-25 Marine Nitrate High Range starter kit (reagent for 25 tests)
1x HI764-25 Marine Nitrite Ultra Low Range starter kit (reagent for 25 tests)
1x HI774-25 Marine Phosphate Ultra Low Range starter kit (reagent for 25 tests)
2x Sample cuvettes and caps
2x 1mL Graduated syringes with tips
1x Mini Pipette with tip
2x 3mL Pasteur pipettes
3x 1.5V AA alkaline batteries
1x Cleaning cloth for wiping cuvettes
1x Scissors
1x Instrument quality certificate
1x Instruction manual
1x Hard carrying case

Testing Parameter



Range 0.0 to 20.0 dkH
0 to 357 ppm (as CaCO3)
Resolution 0.1 dkH
Accuracy ±0.3 dKH ±5 % of reading at 25 °C
±5 ppm ±5 % of reading at 25 °C
Method Colorimetric Method - The reaction causes a distinctive range of colors from yellow to greenish blue to develop


Range 200 to 600 ppm
Resolution 1 ppm
Accuracy ±6 % of reading at 25 °C
Method Adaptation of the Zincon Method


Range 0.00 to 5.00 ppm (as NO3¯)
0.0 to 75.0 ppm (as NO3¯)
Resolution 0.01 ppm
0.1 ppm
Accuracy 0 to 200 ppb (as NO2¯-N)
Method Adaptation of the Zincon Method
Colorimetric Method The reaction between nitrate and the reagent causes a pink/violet tint in the sample.

Nitrite ULR

Range 0 to 200 ppb (as NO2¯-N)
Resolution 1 ppb
Accuracy ±10 ppb ±4 % of reading at 25 °C
Method Adaptation of the EPA Diazotization Method 354.1 - The reaction between nitrite and the reagent causes a pink tint in the sample.


Range 6.3 to 8.6 pH
Resolution 0.1 pH
Accuracy ±0.2 pH of reading at 25 °C
Method Colorimetric Adaptation of the Phenol Red Method

Phosphate LR

Range 0.00 to 0.90 ppm
Resolution 0.01 ppm
Accuracy ±0.02 ppm ±5 % of reading at 25 °C
Method Adaptation of Standard Methods for the Examination of Water and Wastewater, 20th Edition, Ascorbic Acid Method - The reaction between phosphate and the reagent causes a blue tint in the sample.


Light Source Light emitting diode
Light Detector Silicon photocell
Bandpass Filter Bandwidth 8 nm
Bandpass Filter Wavelength Accuracy ±1.0 nm
Logging 200 readings
Power Supply 1.5 V AA Alkaline (3 pcs.)
Battery Life > 800 measurements (without backlight)
Auto-off After 15 minutes of inactivity (30 minutes before a READ measurement)
Environment 0 to 50 °C (32 to 122 °F); 0 to 100% RH, non-serviceable
Dimensions 142.5 x 102.5 x 50.5 mm (5.6" x 4.0" x 2.0")
Weight 380 g (13.4 oz.); with batteries
Warranty 2 years
More Information
Manuals Marine Master HI97105 Owner's Manual
Warranty 2 years
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Product Questions

Can this kit be used to test copper?
Question by: Jake on Jun 27, 2022, 2:58 PM
That is a great question. This unit does not test for copper. It will test for Marine Alkalinity, Calcium, Nitrate(low range and High range), Nitrite ULR, Phosphate ULR, and pH.
Answer by: Rick Pucciarella (BRS Staff) on Jun 28, 2022, 8:35 AM
Can I use this kit for freshwater test or just saltwater.
Question by: AJ Merritt on Nov 8, 2021, 12:21 PM
This is for Saltwater Aquariums.
Answer by: Matt Lucero (BRS Staff) on Nov 8, 2021, 12:33 PM
With this product do you still have to do each test individually or does it perform all tests with just one sample?
Question by: Brian on Nov 7, 2021, 10:32 AM
You still have to preform each test individually.
Answer by: Matt Lucero (BRS Staff) on Nov 8, 2021, 11:57 AM