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Are you struggling to achieve accurate and reliable dissolved oxygen measurements in various environments?

The Starter 300D DO Portable Meter by OHAUS offers a robust solution tailored for precision and ease, ensuring you can measure DO levels wherever your research takes you. With over a century of expertise in precision instruments, OHAUS now extends its renowned accuracy to portable laboratory instruments, making water analysis simpler and more effective.

  • Immediate Use: The galvanic electrode allows immediate operation post-power-up, eliminating the typical wait time associated with other DO meters.
  • Portable and Durable: Designed with a rugged ABS housing and a convenient wrist strap, this meter is built for on-the-go measurements without compromising reliability.
  • High Precision: Achieve accurate readings with a measurement range of up to 45.0 mg/L and precision of up to ±0.3 mg/L, ensuring detailed and dependable results.
  • User-Friendly Features: From its simple calibration process and automatic temperature compensation to its fast response times, the Starter 300D is optimized for a hassle-free user experience.
  • Data Management: Equipped with a 30-measurement memory, this meter allows you to store and recall data effortlessly, including the last calibration details, with just a touch.
  • 5-Year Warranty: Enjoy peace of mind and long-term reliability with a comprehensive 5-year warranty on your investment.

Imagine never having to second-guess your water quality measurements again. With the Starter 300D DO Portable Meter, you'll experience the confidence and peace of mind that comes with knowing you're equipped with top-tier technology from OHAUS. Whether in a lab or the field, this meter solves your analytical challenges and enhances your overall workflow, making it an indispensable tool for any water analysis professional. Invest in the Starter 300D and feel the difference in precision and portability at your fingertips.

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: 20.0 – 45.0 mg/L; 0.00 – 19.99; 200 – 400%; 0 – 50°C

  • Accuracy: ± 1%; ± 0.3 mg/L; ±0.3 °C

  • Measurement Resolution: 0.1%; 1%; 1 mg/L; 0.1 °C; 0.1 ppm; 1 ppm; 0.1 mg/L

  • Display: LCD

  • Electrode: STTEMP30 (Included); STDO11 (Included)

  • Accuracy DO: 1 %

  • Accuracy ± (Temperature): 0.3 °C

  • Battery Life: 250 Hours with Disposable Batteries

  • Calibration: 2 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 DO: 0 % – 200 % ; 200 % – 400 % ; 0 ppm – 20 ppm ; 20 ppm – 45 ppm

  • Measurement Range (Temperature): 0 °C – 50 °C

  • Net Weight: 0.35 lb (0.16 kg)

  • Parameter: Dissolved Oxygen

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

  • Resolution (DO): 0.01; 0.1

  • Resolution Range (DO): 0 – 19.9 ; 20 – 45

  • Temperature compensation: Automatic

  • 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.