Series 4 Portable Combined pH and Conductivity /TDS Meter


Combined pH & Conductivity Meter.

SKU: QP458 Categories: ,

The QP458 Portable combined pH and Conductivity meter is the third in a series of Quality Portable meters from EDT directION.  All are state of the art instruments made in the UK.
The clear backlit graphic display guides the user through every operation ensuring that even the most unskilled operation can perform accurate analysis without an instruction manual.

Every instrument in the QP range has a mini USB output for printing or exporting sample and calibration data. If printing is not possible there is a 10,000 data point, 64 file internal memory to enable field data to be recorded.

Power is via 4 x AA batteries. Lifetime is impressive due to a highly efficient display with brightness and contrast options along with many other power saving features.

Other features include:

- Dual pH and Conductivity Display
- 1 ,2 or 3 Point pH Calibration
- Auto Conductivity Calibration
- Auto endpoint
- Automatic Temperature Compensation (ATC)
- Automatic Standard Recognition
- pH Buffer correction
- Calibration alarms
- Millivolt and Relative millivolt modes
- Total Dissolved Solids (TDS) Mode
- Data logging and internal Data storage.
- Micro USB Data output
- Real time clock
- BNC /DIN and 3.5mm Jack connectors
- Impressive array of accessories and consumables.

The QP range of products are extremely Tough, Splash-proof and practical and carry a two year warranty.

This Combined pH and Conductivity Meter is available as a kit with a full range of accessories here.

Visit our YouTube Channel for more information about our products.

Additional information

Weight 0.4 kg
Dimensions 20 × 10 × 5 cm
TDS Range


TDS Resolution

+/- 0.01g/L

Conductivity Range

Auto-ranging from 0- 999mS/cm in appropriate units.

Conductivity Accuracy

+/- 0.2% of reading.

pH Range

-2 to 16

pH Calibration

Automatic Calibration in all Modes


3.5mm Jack, BNC, Mini DIN

Automatic Temperature Compensation (ATC)

ATC across the entire range for pH and Conductivity

Reference Temperature

Set at 25°C.


Backlit LCD Graphic Display

Power Requirement

4 X AA Batteries

Battery Life

Over 200 Hours continuous use. Power saving features include: Auto off, Backlight control, logging sleep mode.

Data Output

Mini USB. Outputs csv at 38400 Baud

Data Storage

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

Data Logging

Maximum data points 64,000. Log period 10 seconds to 99 hrs.59mins .59 secs Log interval minimum 1 second.


175x88x48mm (lwh) – Meter Only


350g – Meter Only


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Product Brochure


Instruction Manual