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Are you tired of inaccurate and time-consuming pH measurements in your field and lab work?

The Starter 300 pH Portable by Ohaus is here to revolutionize how you measure pH, bringing the accuracy and reliability of Liberty Scales to water analysis and laboratory tasks. With its advanced features tailored for laboratory instruments and rugged field use, this meter ensures precise and efficient measurements every time.

The Starter 300 pH Portable simplifies your measurement process with key features that offer supreme accuracy and user convenience.

Key Benefits:

  • Auto Buffer Recognition: Automatically recognizes four buffer groups, preventing calibration errors and saving time.
  • Automatic Temperature Compensation: Provides accurate pH readings under varying temperature conditions, eliminating the need for manual adjustments.
  • Durable Construction: Features IP54-rated ABS housing that resists water and dust, perfect for tough environments.
  • Convenient Data Management: Stores up to 30 measurements and allows quick recall of the last calibration data, optimizing your data handling.
  • User-Friendly Design: Equipped with a clear LCD and responsive controls for easy operation in any setting.
  • Portable and Ready to Use: Operates with four AAA batteries and includes a meter stand and wrist strap for secure field usage.
  • 5-Year Warranty: Enjoy peace of mind and long-term reliability with a comprehensive 5-year warranty on your investment.

When you choose the Starter 300 pH Portable, you’re not just getting a tool but investing in peace of mind. Imagine the confidence you'll feel with each accurate measurement, supported by a device as reliable in the lab as in the field. Your work will be smoother, quicker, and more precise, leaving you more time to focus on the real challenges of your research. With this portable pH meter, elevate your research and fieldwork to new heights, backed by the precision of Liberty Scales.

Reach out to our dedicated team for further information and personalized assistance. Call us at (661) 888-1919 or email us at We're here to help you every step of the way!


  • Measurement Range: 0 – 100°C; 0.00 – 14.00 pH; -1999 – 1999 mV

  • Accuracy: ±0.5 °C; ±1 mV; ±0.01 pH

  • Measurement Resolution: 0.1 °C; 0.01 pH; 1 mV

  • Display: LCD

  • Electrode: ST322(Included)

  • Accuracy ± (mV): 1 mV

  • Accuracy ± (Temperature): 0.5 °C

  • Battery Life: 500 Hours with Disposable Batteries

  • Calibration: 3 Point

  • Dimensions: 6.69 in x 1.38 in x 3.54 in (170 mm x 35 mm x 90 mm) (LxHxW)

  • In-Use Cover: No

  • Measurement Range (Temperature): 0 °C – 100 °C

  • Measurement Range: -1,999 mV – 1,999 mV

  • Net Weight: 0.35 lb (0.16 kg)

  • Parameter: pH / ORP

  • pH accuracy (±): 0.01

  • pH measuring range: 0 – 14

  • pH resolution: 0.01

  • Power: 4 AAA (LR03) Batteries (Included)

  • Resolution (Voltage): 1 mV

  • Temperature compensation: Yes

  • Temperature resolution: 0.1 °C

  • Temperature Sensor: 30 KΩ NTC

  • Working Environment: 41°F – 104°F, 80% RH, Non-condensing (5°C – 40°C, 80% RH, Non-condensing)
  • Free Shipping: Available across 48 continental USA. Extra charges may apply for residential, farm, or rural areas.
  • Express Shipping: Overnight and faster shipping options available at additional costs. Quotes obtainable via email.
  • Delivery Time: Typically 5 to 7 business days, varying by location and external conditions.
  • Tracking Information: Provided via email upon shipment. Accessible through account login. Additional information available upon request.
  • Return Policy: 15-day return period for unused, original condition products. A 25% restocking fee applies. Buyer covers original and return shipping costs.
  • Customer Support: Contact at (661) 888-1919 or for queries or concerns about shipping.