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SD305 pH / ORP

The SD305 pH/ORP Handheld Meter is a robust and reliable solution for accurate measurement of pH, ORP (Redox) and temperature in demanding field environments. Designed for professional water quality testing, it combines advanced measurement technology with a rugged IP67 waterproof design, making it ideal for reliable on-site analysis.

Featuring high-resolution measurement capabilities, automatic temperature compensation and automatic buffer recognition, the SD305 delivers precise and repeatable results across a wide range of applications. Its durable construction and user-friendly operation make it suitable for use in industrial water systems, water treatment, environmental monitoring and routine quality control.


The large backlit LCD display provides clear visibility of measurement results in all working conditions, while the intuitive interface ensures simple operation. The protective housing provides additional durability and protection, with the integrated rear stand also functioning as a hanger or belt clip for added convenience when working in the field.


The SD305 includes advanced data management features, allowing users to store measurement results using the integrated data logger and transfer collected data to a computer via USB connection. With manual and automatic logging options, it provides an efficient way to record and manage water quality measurements over time.

Key Features

  • Measures pH, ORP (Redox) and temperature
  • Rugged IP67 waterproof housing
  • High-resolution measurement for improved accuracy
  • Automatic temperature compensation
  • Automatic buffer detection
  • Large backlit LCD display
  • Manual and automatic data logging functions
  • USB interface for data transfer
  • Min/max value memory
  • Auto-hold and auto-off functions
  • Battery and electrode status indicators
  • Portable design for field use

Applications

  • Boiler Water
  • Cooling Water
  • Drinking Water Treatment
  • Pool Water Control
  • Wastewater Treatment

Technical Data

  • Measurement Parameters:
    • pH: -2 – 16
    • ORP (Redox): -2000.0 – 2000.0 mV
    • Temperature: -5 – 150 °C
  • Display: Backlit LCD
  • Resolution:
    • pH: 0.001
    • ORP: 0.1 mV
  • Calibration:
    • Automatic or manual
    • 1, 2 or 3-point calibration
  • Temperature Compensation: Automatic
  • Data Logger:
    • Manual Logger: 1,000 data sets
    • Automatic Logger: 10,000 data sets
    • Recording interval: 1 – 3600 seconds
  • Interfaces: USB
  • Power Supply:
    • 2 x AAA batteries
    • Micro USB
  • Battery Life: 500 hours
  • Auto-Off: Yes
  • IP Rating: IP67
  • Compliance: CE
  • Operating Languages:
    • German
    • English
    • French
    • Spanish
    • Italian
    • Portuguese
    • Dutch
    • Chinese
  • Dimensions: 128 x 164 x 37 mm
  • Weight: 287 g

   Order Code   Description 
724640
SD305 pH/ORP
721226SD pH electrode type 226 with gel electrolyte
721242 Redox electrode, plastic/gel, BNC-plug, approx. 1 m cable

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