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Nutrient Analysis Photometer


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*Applies to 48 contiguous United States. Standard UPS Ground shipping. No promo code needed. Exclusions may apply.
HI83325 is a compact, multiparameter photometer for use in the environmental lab or in the field. The meter is one of the most advanced photometers available with a innovative optical design that utilizes a reference detector and focusing lens to eliminate errors from changes in the light source and from imperfections in the glass cuvette. This meter has 9 different programmed methods measuring 8 key plant nutrient water quality parameters and also offers an absorbance measurement mode for performance verification and for users that would like to develop their own concentration versus absorbance curves. Plant nutrient-specific parameters include potassium, calcium, and magnesium.


To save valuable laboratory benchtop space, the HI83325 doubles as a professional pH meter with its digital pH/temperature electrode input. Now one meter can be used for both photometric and pH measurements.


Get your reagents here.

  • Advanced optical system
  • Digital pH electrode input


    Save valuable bench space with one meter that works both as a photometer and as a laboratory pH meter
  • Absorbance measuring mode


The HI83325 benchtop photometer measures 8 different key water quality parameters using 9 different methods. This photometer features an innovative optical system that uses LEDs, narrow band interference filters, focusing lens and both a silicon photodetector for absorbance measurement and a reference detector to maintain a consistent light source ensures accurate and repeatable photometric readings every time.

Consistent and thorough monitoring of plant nutrients is essential to maintaining healthy growth and reproduction. This is easy with the HI83325, a comprehensive way to monitor vital plant nutrients such as potassium, calcium and magnesium. Required in large quantities, potassium plays a vital role in water uptake and enzyme regulation. Calcium helps to strengthen plant cell walls protecting against heat stress while magnesium helps build a strong immune system.

A digital pH electrode input allows the user to measure pH by a traditional glass electrode. The digital pH electrode has a built in microchip within the probe that stores all of the calibration information. Having the calibration information stored in the probe allows for hot swapping of pH electrodes without having to recalibrate. All pH measurements are automatically compensated for temperature variations with a built in thermistor located in the tip of the sensing bulb for fast and accurate temperature measurement.

The HI83325 offers an absorbance measuring mode that allows for CAL Check standards to be used to validate the performance of the system. The absorbance mode allows the user to select one of the three wavelengths of light (420 nm, 466 nm, and 525 nm) to measure and plot their own concentration versus absorbance mode. This is useful for users with their own chemical method and for educators to teach the concept of absorbance by using the Beer-Lambert Law.

Two USB ports are provided for transferring data to a flash drive or computer and to use as a power source for the meter. For added convenience and portability the meter can also operate on an internal 3.7 VDC Lithium-polymer rechargeable battery.

Please note, reagents are not included and can be purchased here.



Backlit 128 x 64 Pixel Graphic LCD Display

  • Backlit graphic display allows for easy viewing in low light conditions
  • The 128 x 64 Pixel LCD allows for a simplified user interface with virtual keys  and on-screen help to guide the user through use of the meter

Built-in Reaction Timer for Photometric Measurements

  • The measurement is taken after the countdown timer expires.
  • Countdown timer ensures that all readings are taken at the appropriate reaction intervals regardless of user for better consistency in measurements

Absorbance mode

  • Hanna's exclusive CAL Check cuvettes for validation of light source and detector
  • Allows for the user to plot concentration versus absorbance for a specific wavelength for use with user supplied chemistry or for teaching principles of photometry

Units of Measure

  • Appropriate unit of measure along with chemical form is displayed along with reading

Result Conversion

  • Automatically convert readings to other chemical forms with the touch of a button

Cuvette Cover

  • Aids in preventing stray light from affecting measurements

Digital pH Electrode Input

  • Measure pH and temperature with a single probe
  • Good Laboratory Practice (GLP) to track calibration information including date, time, buffers used, offset and slope for traceability
  • pH CAL Check alerts user to potential problems during the calibration process
  • Space saving having a pH meter and photometer built into one meter

Data Logging

  • Up to 1000 photometric and pH readings can be stored by simply pressing the dedicated LOG button. Logged readings are just as easily recalled by pressing the RCL button
  • Sample ID and User ID information can be added to a logged reading using alphanumeric keypad


  • Logged readings can be quickly and easily transferred to a flash drive using the USB-A host port or to a computer using the micro USB-B port
  • Data is exported as a .CSV file for use with common spreadsheet programs

Battery Status Indicator

  • Indicates the amount of battery life left

Error Messages

  • Photometric error messages include no cap, high zero, and standard too low
  • pH calibration messages include clean electrode, check buffer and check probe

On-screen Features

method selection

Method Selection
Users can easily select any one of the 9 measurement methods via the dedicated METHOD button.

data logging

Data Logging
Up to 1000 measurement readings can be logged with user and sample ID and recalled for future use.

ph measurement mode

pH Measurement Mode
Selecting the pH measurement mode allows for the photometer to be used as a professional pH meter with many features including temperature compensated measurements, automatic two point calibration, and GLP.


Advanced Optical System

HI83325 is designed with an innovative optical system that incorporates a beam splitter so that light can be used for absorbance readings and for a reference detector. The reference detector monitors the intensity of light and modulates when there is drift due to power fluctuation or the heating of the optical components. Each part has an important role in providing unparalleled performance from a photometer.


photometer multiparameter optical

High Efficiency LED Light Source

An LED light source offers superior performance as compared to a tungsten lamp. LEDs have a much higher luminous efficiency, providing more light while using less power. They also produce very little heat, which could otherwise affect the optical components an electronic stability. LEDs are available in a wide array of wavelengths, whereas tungsten lamps are supposed to be white light (all wavelengths of visible light) but actually have a poor blue/violet light output.

High Quality Narrow Band Interference Filters

The narrow band interference filter not only ensure greater wavelength accuracy (+/- 1 nm) but are extremely efficient. The filters used allow up to 95% of the light from the LED to be transmitted as compared to other filters that are only 75% efficient. The higher efficiency allows for a brighter, stronger light source. The end result is higher measurement stability and less wavelength error.

Reference Detector for a Stable Light Source

A beam splitter is used as part of the internal reference system of the HI83325 photometer. The reference detector compensates for any drift due to power fluctuations or ambient temperature changes. Now you can rely on a stable source of light between your blank (zero) measurement and sample measurement.

Large Cuvette Size

The sample cell of the HI83325 fits a round, glass cuvette with a 25 mm path length. Along with the advanced optical components, the larger size of the cuvette greatly reduces errors in rotation from the indexing mark of the cuvettes. The relatively long path length of the sample cuvette allows the light to pass through more of the sample solution, ensuring accurate measurements even in low absorbance samples.

Focusing Lens for Greater Light Yield

Adding a focusing lens to the optical path allows for the collection of all of the light that exits the cuvette and focusing the light on the silicon photo detector. This novel approach to photometric measurements cancels the errors from imperfections and scratches present in the glass cuvette eliminating the need to index the cuvette.


Nutrient Analysis Photometer

We believe that analytical testing should be simple. Each HI83325 Nutrient Analysis Photometer is supplied with necessary accessories in durable carrying case, including:

  • Sample Cuvette and Cap (4 pcs.)
  • Cloth for Wiping Cuvettes
  • Scissors
  • USB Cable
  • 5 Vdc Power Adapter
  • Instruction Manual
  • Quality Certificate
  • 100 mL plastic graduated beaker with cap
  • 170 mL plastic graduated beaker 
  • 3 mL plastic pipette
  • 5 mL graduated syringe
  • 60 mL graduated syringe
  • graduated cylinder
  • spoon
  • funnel
  • filter paper
  • demineralizer bottle for 10 L of water
  • activated carbon for 50 tests


*Please note, reagents are not included but can be purchased here.

Parameter Range Resolution Accuracy (at 25 °C) Method Wavelength Reagent Code
Absorbance 0.000 to 4.000 Abs 0.001 Abs +/-0.003Abs @ 1.000 Abs      
Ammonia, Low Range 0.00 to 3.00 mg/L (as NH3 -N) 0.01 mg/L ±0.04 mg/L ±4% of reading Adaptation of the ASTM Manual of Water and Environmental Technology, D1426 Nessler method. 420 nm HI93700-01
Ammonia, Medium Range  0.00 to10.00 mg/L (as NH3 -N) 0.01 mg/L ±0.05 mg/L ±5% of reading Adaptation of the ASTM Manual of Water and Environmental Technology, D1426, Nessler method 420 nm HI93715-01
Ammonia, High Range  0.0 to 100.0 mg/L (as NH3 -N) 0.1 mg/L ±0.5 mg/L ±5% of reading Adaptation of the ASTM Manual of Water and Environmental Technology, D1426, Nessler method 420 nm HI93733-01
Calcium 0 to 400 mg/L (as Ca2+)  1 mg/L  ±10 mg/L ±5% of reading  Adaptation of the Oxalate method 466nm  HI937521-01
Magnesium  0 to 150 mg/L (as Mg2+)  1 mg/L  ±5 mg/L ±3% of reading  Adaptation of the Calmagite method  466 nm HI937520-01
Nitrate  0.0 to 30.0 mg/L (as NO3 - N)  0.1 mg/L  ±0.5 mg/L ±10% of reading  Adaptation of the cadmium reduction method 525 nm  HI93728-01
pH  6.5 to 8.5 pH  0.1 pH  ±0.1 pH  Adaptation of the Phenol Red method  525 nm HI93710-01
Phosphate, High Range  0.0 to 30.0 mg/L (as PO4 3-)  0.1 mg/L  ±1.0 mg/L ±4% of reading  Adaptation of the Standard Methods for the Examination of Water and Wastewater, 18th edition, Amino Acid method  525 nm HI93717-01
Potassium  0.0 to 20.0 mg/L (as K)  0.1 mg/L  ±3.0 mg/L ±7% of reading  Adaptation of the Turbidimetric Tetraphenylborate method  466 nm HI93750-01
Sulfate  0 to 150 mg/L (as SO42-)  1 mg/L  ±5 mg/L ±3% of reading  Sulfate is precipitated with barium chloride crystals  466 nm HI93751-01
**  Reagents for 50 tests.†  Unless noted otherwise, all reagent codes ending with -01 are for 100 tests.

General Meter

Wavelength Accuracy ±1 nm
Light Source 3 LEDs with 420 nm, 466 nm, and 525 nm narrow band interference filters
Spectral bandwidth 8 nm
Input Channels 1 pH electrode input and 3 photometer wavelengths
pH Electrode digital pH electrode (not included)
Logging Type log on demand with user name and sample ID optional input
Logging Memory 1000 readings
Connectivity USB-A host for flash drive; micro-USB-B for power and computer connectivity
GLP calibration data for connected pH electrode
Display 128 x 64 pixel LCD with backlight
Battery Type / Life 3.7 VDC Li-polymer rechargeable battery / >500 photometric measurements or 50 hours of continuous pH measurement
Power Supply 5 VDC USB 2.0 power adapter with USB-A to micro-USB-B cable (included)
Environment 0 to 50.0 oC (32 to 122.0 oF); 0 to 95% RH, non-condensing
Dimensions 206 x 177 x 97 mm (8.1 x 7.0 x 3.8")
Weight 1.0 kg (2.2 lbs.)
Photometer/Colorimeter Light Detector silicon photodetector
Cuvette Type round, 24.6 mm
Number of Methods 128 max.
Ordering Information HI83225 is supplied with sample cuvettes and caps (4 ea.), cloth for wiping cuvettes, USB to micro USB cable connector, power adapter and instruction manual.


*Please note, reagents are not included but can be purchased here.