OHAUS ST20M Pen pH and Conductivity Meter

Available now: The OHAUS ST20M Pen pH/Conductivity Meter  offers a portable design, 0-14 pH range, 0.01 pH resolution, ±1% conductivity accuracy, auto temperature compensation, and USB connectivity for versatile field or lab use. Seize the opportunity to acquire this meter at a reduced cost.


The OHAUS ST20M Pen pH and Conductivity Meter is a versatile instrument designed for precise measurement of pH and conductivity in various aqueous solutions. It offers accurate readings with user-friendly operation, making it suitable for laboratory, field, and educational applications. With its compact and portable design, the ST20M provides convenience without compromising on performance.

Technical Specifications and Features:

Technical Specifications:

The OHAUS ST20M Pen pH and Conductivity Meter boasts the following technical specifications:

  • pH Range: 0.00 to 14.00 pH
  • pH Resolution: 0.01 pH
  • Conductivity Range: 0 to 1999 µS/cm
  • Conductivity Resolution: 1 µS/cm
  • Temperature Range: 0 to 50°C (32 to 122°F)
  • Temperature Resolution: 0.1°C (0.1°F)
  • Accuracy: ±0.01 pH; ±2% Full Scale (conductivity); ±0.5°C (temperature)

Functional Attributes:

The meter incorporates several functional attributes to enhance its usability and reliability:

  1. Dual Measurement: Simultaneous measurement of pH and conductivity allows for efficient data collection.
  2. Automatic Temperature Compensation (ATC): Ensures accurate readings by compensating for temperature variations during measurement.
  3. Calibration: Simple one-point calibration for pH and automatic calibration for conductivity ensure accuracy in measurements.
  4. Compact Design: The pen-style construction makes the meter lightweight and easy to handle, ideal for on-the-go measurements.
  5. LCD Display: A large LCD screen offers clear visibility of readings, facilitating easy interpretation of data.
  6. Long Battery Life: Equipped with long-lasting batteries, the meter ensures uninterrupted operation during fieldwork or extended laboratory sessions.

Connectivity Options:

The ST20M features USB connectivity, enabling data transfer to compatible devices for further analysis and documentation. This feature enhances the versatility of the meter and facilitates seamless integration into laboratory or fieldwork setups.

In conclusion, the OHAUS ST20M Pen pH and Conductivity Meter offers precision, reliability, and portability in measuring pH and conductivity levels. Its user-friendly design, coupled with advanced features, makes it a valuable tool for various applications in research, education, and quality control environments. Whether in the lab or in the field, the ST20M delivers accurate results consistently, ensuring reliable data for informed decision-making.


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