Series 4 Portable Ion Meter


Dedicated to the measurement of ions in water.

The QP459 Portable Ion Meter is dedicated to the measurement of ions in water including Dissolved Oxygen. Dual ION mode allows for the Measurement two separate species without the need for recalibration. The ION species is displayed along with concentration in units of your choice. Continuously monitor using the ION logging function. Use Known Addition mode for rapid ion analysis which corrects for the background effects of the sample matrix. The Portable Ion Meter is easy to use with Auto End Point and 1,2 or 3 point automatic calibration. For Field or Laboratory measurement toggle between Low or High Resolution mode. Every instrument in the QP range has a mini USB output for printing or exporting sample and calibration data. Record field data using the 10,000 data point - 64 file internal memory when printing is not available. Features include:

  • 1 ,2 or 3 Point Calibration
  • Auto endpoint
  • Selectable standards from 1,10,100 and 1000ppm
  • Calibration alarms
  • Direct display of Ion Species and Concentration (25 Ion Species available)
  • Dual Ion Mode
  • Dissolved Oxygen Mode
  • Known Addition (Rapid Ion Mode)
  • pH, Millivolt and Relative millivolt modes (identical to QP451 pH Meter)
  • Data logging and internal data storage
  • Micro USB data output

The QP range of products are extremely tough, splash-proof and are suitable for field and laboratory work. All meters carry a two year warranty. The QP459 has a BNC socket and is compatible for use with any make of ISE, pH and REDOX electrode with a BNC connector. This portable ion meter contains all the features available in the QP451 Portable pH Meter. Visit our YouTube Channel for more information.

Additional information

Weight 0.400 kg
Dimensions 30 × 14 × 14 cm
Temperature Compensation

Fully Automatic for pH only. No ATC for ISE work:
Samples and standards should be the same temperature for optimum Ion analysis.


BNC (pH) 3.5mm Jack (ATC).

pH Range

-2 to 16.00 pH Units

pH Calibration

1, 2 or 3 point Automatic Calibration. ( 1,10,100 and 1000ppm options)

mV Range

+/- 1999.9 mV

mV Accuracy

+/- 0.1 mV over the entire range.

pH Accuracy

Resolves to +/- 0.01 pH Units


350g (Meter Only)

Power Requirement

4 x AA Battery


175 x 88 x 48mm

Temp Accuracy

+/- 0.1 Degree over the -5 to 105 Degree range

Battery Life

250 hours continuous use. Auto switch off and Power saving options.

Data Output

Mini USB. Outputs csv. 38400 Baud. Dumps data directly to Excel using the DK400 Data Kit

Data Storage

Dynamic storage of up to 64 Data files. Logging maximum 10,000 data points.


2 Year Warranty. Excludes Electrodes accessories and consumables and Misuse.

Ion Accuracy

Typical expected accuracy +/- 5% in clean aqueous samples. Application dependant.


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Instruction Manual