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Do you need help obtaining accurate dissolved oxygen readings in various water environments?

The Ohaus Starter 300D DO Portable Meter is your solution, designed to deliver precise and reliable water analysis wherever your work takes you. This device embodies the century-old Ohaus tradition of precision and reliability, now tailored specifically for your laboratory and field needs.

Key Features:

  • Immediate Usability: Activate the galvanic electrode and start measuring without delay—no wait time needed.
  • High Accuracy: Enjoy precise measurements with an accuracy of ±1% for DO and ±0.3 mg/L for specific ranges, ensuring dependable results every time.
  • Robust Memory Capability: Store up to 30 measurements and easily access the last calibration data with a simple touch, enhancing your efficiency in the field.
  • Automatic Temperature Compensation: Achieve accurate readings in varying temperatures from 0 to 50°C, critical for field studies.
  • Convenient Design: Lightweight with durable ABS housing and equipped with a handy wrist strap, this meter is designed for portability and resilience.
  • Long-Lasting Power: Operated by 4 AAA batteries included with the meter, ensuring you’re always ready to conduct tests.
  • 5-Year Warranty: Enjoy peace of mind and long-term reliability with a comprehensive 5-year warranty on your investment.

Imagine the confidence and convenience you will experience with the Ohaus Starter 300D DO Portable Meter. With its user-friendly operation and dependable construction, you can focus more on analyzing results and less on handling equipment. Whether you are a field researcher, lab technician, or environmental scientist, this meter allows you to measure dissolved oxygen quickly and accurately, ensuring that your water quality assessments are never compromised. Choose the Starter 300D DO Portable and experience laboratory precision in the palm of your hand.

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 (Available as an accessory); STDO11 (Available as an accessory)

  • 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: 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.