Horiba D-73 Portable Multiparameter Ion, pH and ORP Meter

In stock

The Horiba D-73 meter allows you to test a range of ions including Nitrate Nitrogen, Ammonia Nitrogen, Potassium, Calcium, Fluoride & Chloride. Also concurrently test pH and ORP. This meter is ideal for testing water quality and soil samples.

Horiba D-73 Portable Multiparameter Ion, pH and ORP Meter


This meter does not come with any electrodes, please choose the desired sensor from the appropriate category.



  • Economical meter for Ion, pH, ORP, and temperature measurement
  • 2 Channels double the testing potential of the meter - One channel for pH and ORP, and another for Ion testing
  • Choose from a wide selection of electrodes to fit specific testing situations (sold separately)
  • Sample ID number setting function
  • Revolutionary waterproof meter and electrodes make testing in the field easy and care-free (Conforms to waterproof standard of IEC529:IP67)
  • Quick connection to a PC allows for easy and fast data evaluation
  • Automatic data-logging function stores up to 1,000 readings
  • 5-point calibration for highly accurate readings
  • Self diagnostic function ensures reliable monitoring of battery voltage, calibration, LCD checks and temperature testing
  • User-friendly operation and portability with a large Backlit LCD display


The Horiba D-73 meter allows the user to test the Ion, pH, ORP, and temperature of samples of many different types. The wide range of electrodes allows the user to customize the measurement method to best fit their testing situation. This meter was designed to be used in the field or the lab as it is waterproof yet highly accurate. This versatility makes testing care-free and easy in all situations.


Horiba Instruments Inc. is famous for the quality of its measurement devices and electrodes. The Horiba D-72 is interchangeable with any of the electrodes found in the Horiba pH electrode category. The full listing of pH electrodes can be found here.


The optional ORP electrode can be found here.


Horiba Instruments Inc is famous for the quality of its measurement devices and electrodes. Using this one high quality meter you can choose from their huge range of Ion Selective Electrodes (ISE) for the following ions:


  • Nitrate Nitrogen,
  • Ammonia Nitrogen,
  • Potassium,
  • Calcium
  • Fluoride,
  • Chloride

The complete list of available Ion Selective Electrodes can be found here.


The Horiba D-70 series of field and lab meters all come with the ability to connect the meter to your PC for easy data collection and storage. You can also use the meter to connect to a printer output so you can print off your data and findings directly either in the lab or the field (except for the D-71).


The Horiba D-70 series meters are among the highest quality IP-67 rated waterproof meters and electrodes available. Used primarily for water analysis, it can easily be used to test a huge range of liquid samples such as soil samples, plant sap samples, liquid fertilizers, compost tea and even your fruit and vegetable juices.


The D-70 series comprises of the following meters, all of which are available from Agriculture Solutions LLC.


D-71 - Economical meter for pH and temperature.

D-72 - Multi-parameter meter for ph/temperature/ORP with PC/printer output capability.

D-73 - Multi-parameter meter for pH/temperature/ORP/ISE with PC/printer output capability.

D-74 - Multi-parameter meter for pH/temperature/ORP/conductivity with PC/printer output capability.

D-75 - Multi-parameter meter for pH/temperature/ORP/dissolved oxygen with PC/printer output capability.


All meters are of the highest quality. None of the D-70 series meters come with electrodes allowing you to choose exactly which electrodes you prefer and easily replace old or broken electrodes without replacing the top-of-the-line meter. For a full range of electrodes for this meter visit the D-70 series electrodes page.





  • Display Range (Ion): 0.00 μg/L to 999 g/L
  • Display Range (pH): -2.00 to 16.00 (Flashing in the case of outside measurement range)
  • Dispay Range (ORP): -2000 to 2000 mV (Flashing in the case of outside measurement range)
  • Temperature Range: 0.0 to 100°C (Resolution: 0.1°C)
  • Repeatability:
    • Ion: ± 0.5% F.S. ± 1 digit
    • pH: ± 0.01pH ± 1 digit
    • ORP: ± 1 mV ± 1 digit
    • Temperature: ± 0.1°C ± 1 digit
  • Resolution: 
    • Ion: 3-digit valid numbers
    • pH: 0.01 pH
    • ORP: 1 mV
    • Temperature: 0.1°C
  • Power Supply: LR03/AAA alkaline batteries or AAA Ni-H rechargeable batteries × 2, AC adapter 100 V to 240 V 50/60 Hz (optional)
  • Mass: Approximately 270g (without batteries or probe)


Unit Ship Weight: 4 lbs



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