Top rated dissolved oxygen meters and accessories

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AI-generated summary · updated July 28, 2026 · verify details before purchase.

1. 

   1 Best overall HACH

   Hach HQ30d Flexi Dissolved Oxygen Meter

   ★★★★☆4.5/5 $157.00

   Highly accurate and reliable, suitable for a wide range of applications. Offers advanced features like automatic temperature compensation.

   • High accuracy
   • Durable design
   • Easy to use

   • Expensive

   View on Amazon manufacturer site
2. 

   2 Best for field use YSI

   YSI Pro20 Dissolved Oxygen Meter

   ★★★★☆4.3/5 $1,103.88 Only 1 left

   Rugged and waterproof, ideal for outdoor and field measurements. Offers fast and accurate readings.

   • Rugged design
   • Fast response time
   • Accurate readings

   • Limited advanced features

   View on Amazon manufacturer site
3. 

   3 Best budget pick Extech

   Extech DO700 Dissolved Oxygen Meter

   ★★★★☆4.2/5 $1,048.50 Only 1 left

   Affordable and easy to use, suitable for basic dissolved oxygen measurements. Offers good accuracy and reliability.

   • Affordable
   • Easy to use
   • Good accuracy

   • Limited features
   • Not suitable for advanced applications

   View on Amazon manufacturer site
4. 

   4 Best for laboratory use GIDIGI

   Thermo Scientific Orion Star A222 Dissolved Oxygen Meter

   ★★★★☆4.5/5 $65.99

   Highly accurate and reliable, suitable for laboratory and research applications. Offers advanced features like temperature control and data logging.

   • High accuracy
   • Advanced features
   • Durable design

   • Expensive
   • Complex to use

   View on Amazon manufacturer site
5. 

   5 Best for wastewater treatment Apera Instruments

   Hanna Instruments HI9828 Dissolved Oxygen Meter

   ★★★★☆4.3/5 $404.49 Only 7 left

   Suitable for wastewater treatment and environmental monitoring applications. Offers good accuracy and reliability.

   • Good accuracy
   • Rugged design
   • Easy to use

   • Limited advanced features

   View on Amazon manufacturer site
6. 

   6 Best for education and training EZTOCH

   Oakton DO110 Dissolved Oxygen Meter

   ★★★★☆4.1/5 $67.99 Only 19 left

   Affordable and easy to use, suitable for educational and training purposes. Offers good accuracy and reliability.

   • Affordable
   • Easy to use
   • Good accuracy

   • Limited features
   • Not suitable for advanced applications

   View on Amazon manufacturer site

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