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HI-83325-02 Multi-parameter Photometer with pH meter for Plant Nutrient analysis

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One meter can be used for both photometric and pH measurements. The HI-83325 benchtop photometer measures 8 different plant nutrient water quality parameters using 9 different methods. 

Advanced optical system
8 key plant nutrient water quality parameters

£834.00 (exc.VAT)
£1,000.80 (tax incl.)
Full Description Specification Manuals

This photometer ensures accurate and repeatable photometric readings every time. Key parameters are: Ammonia, Calcium, Magnesium, Nitrate, Phosphorus, Potassium, Sulphate and pH.

HI-83325-02 Plant Nutrient Analysis Photometer with pH meter

Advanced optical system - Unparalleled performance from a benchtop photometer.

Consistent and thorough monitoring of plant nutrients is essential to maintaining healthy growth and reproduction. This is easy with the HI-83325, 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 HI-83325 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.

Key features:

  • Advanced optical system with brighter, long-lasting LED light source
  • Backlit 128 x 64 Pixel Graphic Liquid Crystal Display
  • Built-in Reaction Timer for Photometric Measurements
  • Absorbance mode - concentration versus absorbance
  • Units of Measurement plus chemical form displayed
  • Result conversion at the touch of a button
  • Cuvette cover
  • pH and temperature measurement with a single probe
  • Good Laboratory Practice (GLP) - track calibration information including date, time, buffers used, offset and slope for traceability
  • CAL Check alerts user to potential problems during the calibration process
  • Data Logging - Up to 1000 photometric and pH readings can be stored.
  • Logged readings can be quickly and easily transferred to a flash drive or to a PC. Data is exported as a .CSV file for use with spreadsheet programs.
  • Battery Status Indicator
  • Error Messages

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 and 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 HI-83300 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 HI-83308 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.

Read More

Input Channels1 pH electrode input and 3 photometer wavelengths
pH ElectrodeDigital pH electrode (not included)
Logging typeLog on demand with user name and sample ID optional input
Logging Memory1000 readings
ConnectivityUSB-A host for flash drive; micro-USB-B for power and computer connectivity
GLPCalibration data for connected pH electrode
Display128 x 64 pixel LCD with backlight
Battery Type/Life3.7 VDC Li-polymer rechargeable battery/ >500 photometric measurements or 50 hours of continuous pH measurement
Power supply5 VDC USB 2.0 power adapter with USB-A to micro-USB-B cable (included)
Environment0 to 50.0°C (32 to 122.0°F; 0 to 95% RH, non-condensing
Dimensions206 x 177 x 97mm (8.1 x 7.0 x 3.8")
Weight1.0 kg (2.2lbs)
Photometer/Colorimeter Light Source3 LEDs with 420nm, 466nm, 525nm, 575nm, and 610nm narrow band interference filters
Photometer/Colorimeter Light DetectorSilicon Photodetector
Bandpass filter Bandwidth8nm
Bandpass filter wavelength accruacy+-1nm
Cuvette TypeRound, 24.6mm
Number of Methods128 Max
Ordering InformationHI-83325 is supplied with sample cuvettes and caps (x4), cloth for wiping cuvettes, USB to micro USB cable connector, power adapter and instruction manual.


Ammonia RangeLow Range: 0.00 to 3.00 mg/L (as NH3-N) Medium Range: 0.00 to 10.00 mg/L (as NH3-N) High Range: 0.0 to 100.0 mg/L (as NH3-N)
Ammonia Resolution0.01 mg/L; 0.1 mg/L
Ammonia AccuracyLow Range: ±0.04 mg/L ±4% of reading Medium Range: ±0.05 mg/L ±5% of reading High range: ±0.5 mg/L ±5% of reading at 25 °C
Ammonia MethodAdaptation of the ASTM Manual of Water and Environmental Technology, D1426-92, Nessler method


Calcium RangeFreshwater: 0 to 400 mg/L (as Ca2+)
Calcium Resolution1 mg/L
Calcium AccuracyFreshwater: ±10 mg/L ±5% of reading
Calcium MethodFreshwater: Adaptation of the Oxalate method


Magnesium Range0 to 150 mg/L (as Mg2+)
Magnesium Resolution1 mg/L
Magnesium Accuracy±5 mg/L ±3% of reading
Magnesium MethodAdaptation of the Calmagite method


Nitrate Range0.0 to 30.0 mg/L (as NO3-- N)
Nitrate Resolution0.1 mg/L
Nitrate Accuracy±0.5 mg/L ±10% of reading
Nitrate MethodAdaptation of the cadmium reduction method


Phosphate RangeHigh range: 0.0 to 30.0 mg/L (as PO43-)
Phosphate Resolution0.1 mg/L
Phosphate AccuracyHigh Range: ±1 mg/L ±4% of reading
Phosphate MethodHigh Range: Adaptation of the Standard Methods for the Examination of Water and Wastewater, 18th edition, Amino Acid method


Potassium Range0.0 to 20.0 mg/L (as K)
Potassium Resolution0.1 mg/L
Potassium Accuracy±3.0 mg/L ±7% of reading
Potassium MethodAdaptation of the Turbidimetric Tetraphenylborate method


Sulphate Range0 to 150 mg/L (as SO42-)
Sulphate Resolution1 mg/L
Sulphate Accuracy±5 mg/L ±3% of reading
Sulphate MethodTurbidimetric - Sulphate is precipitated with barium chloride crystals
Ammonia HR, MR & LRHR - HI-93733-01 (100 tests); HI-93733-03 (300 tests); MR - HI-93715-01 (100 tests); HI-93715-03 (300 tests); LR - HI-93700-01 (100 tests); HI-93700-03 (300 tests)
CalciumHI-937521-01 (50 tests); HI-937521-03 (150 tests)
Calcium and MagnesiumHI-93752-01 (50 x 2 tests) HI-93752-03 (150 x 2 tests)
MagnesiumHI-937520-01 (50 tests); HI-937520-03 (150 tests)
NitrateHI-93728-01 (100 tests); HI-93728-03 (300 tests)
Phosphate - HRHR - HI-93717-01 (100 tests); HI-93717-03 (300 tests)
PotassiumHI-93750-01 (100 tests); HI-93750-03 (300 tests)
SulphateHI-93751-01 (100 tests); HI-93751-03 (300 tests)
Ordering information for suction lysimeterAll include capillary rubber tube with rubber cap and finger clamp, cleaning solution starter kit (120ml), 30ml syringe and instruction.
HI-83900-3030cm sampler tube ending with porous ceramic tip
HI-83900-6060cm sampler tube ending with porous ceramic tip
HI-83900-9090cm sampler tube ending with porous ceramic tip
Accessories (buy separately)HI-83900-25 Cleaning solution kit, 500ml