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Are you struggling with unreliable and cumbersome water testing equipment?

Discover the simplicity and accuracy of the Ohaus Starter Pen Meter ST20, a compact solution designed to bring the precision of laboratory instruments directly to your fingertips. This versatile meter combines the trusted expertise of Liberty Scales with cutting-edge technology, offering fast, reliable measurements for pH and temperature, essential for thorough water analysis. Its user-friendly operation and robust design make it an ideal choice for both professionals and hobbyists needing dependable meter and electrodes performance.

Key Benefits:

  • Wide Measurement Range: Accurately measures from 0.00 to 14 pH and 0.0 to 99.0 °C, ensuring comprehensive water analysis.
  • High Precision: Delivers results with an accuracy of ±0.05 pH and ±0.5 °C, enabling precise adjustments for optimal water conditions.
  • Durable and Waterproof: Features a rugged ABS housing with an IP67 waterproof rating, perfect for use in demanding environments.
  • Portable Convenience: Lightweight and compact, these starter pen meters are designed for on-the-go measurements with a protective sensor cap and a wrist strap to prevent accidental drops.
  • Energy Efficient: Equipped with an automatic shut-off feature that extends battery life, making it a practical tool for extended use.
  • Ease of Use: No complicated setup – simple operation powered by readily available 1.5V batteries (included), so you can start measuring immediately.
  • 5-Year Warranty: Enjoy peace of mind and long-term reliability with a comprehensive 5-year warranty on your investment.

Imagine the confidence you’ll feel using the Ohaus Starter Pen Meter ST20. Not only will it streamline your water testing process, but it will also provide the reliability and accuracy you need to make informed decisions about water quality. With this meter, you can expect to achieve professional-grade results, enhancing your efficiency and ensuring the precision required for effective water analysis. Experience the peace of mind that comes with knowing you have a top-quality tool in hand, enhancing your water testing capabilities seamlessly and effectively.

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!


  • Meter Type: pH

  • Measurement Range: 0.0 – 99.0 °C; 0.00 – 14 pH

  • Accuracy: ± 0.05 pH / ± 0.5 °C

  • Measurement Resolution: 0.01 pH

  • Display: LCD

  • ATC: Yes

  • Temperature compensation: Automatic

  • Accuracy ± (Temperature): 0.5 °C

  • Automatic Shutdown: Yes, After 6 minutes of non-use

  • Battery Life: 200 Hours with Disposable Batteries

  • Calibration: 3 Point

  • Dimensions: 1.5 in x 7.28 in x 1.77 in (38 mm x 185 mm x 45 mm) (LxHxW)

  • Measurement Range (Temperature): 0 °C – 99 °C

  • Net Weight: 3.88 oz (110 g)

  • Number of Buttons: 3

  • pH accuracy (±): 0.05

  • pH measuring range: 0 – 14

  • Power: 4 AG13 Batteries (Included)

  • Protection Rating: IP67

  • Temperature Display: Yes

  • Temperature Range: 0 °C – 99 °C

  • Temperature Sensor: 50 KΩ NTC

  • Working Environment: 50°F – 104°F, 85%RH, non-condensing (10°C – 40°C, 85% RH, non-condensing)

  • Wrist Strap: Yes
  • 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.