The YSI Pro20i dissolved oxygen meter is a rugged, user-friendly instrument for measuring dissolved oxygen. Depending on your needs, you can choose between a user-replaceable Polarographic DO sensor or a Galvanic DO sensor.
Top Features
- Integral (built-in) field cable in 1, 4, and 10-meter variations with user-replaceable DO sensors
 
- One Touch Cal for convenient and quick calibration
 
- Choice of DO sensor (Polarographic or Galvanic) 
 
- Military spec connectors, IP-67 waterproof, and 1-meter drop tested
 
- Rubber over-molded case
 
- Low total cost of ownership
 
- Internal barometer for highest accuracy
 
- 95% response in 8 seconds with standard membrane
 
- Stores 50 data sets
 
- Graphic, backlit display and glow-in-the-dark keypad visible with polarized sunglasses on
 
- Multiple languages include English, Spanish, French, and German
 
- 3-year instrument warranty; 2-year cable warranty; 1-year polarographic sensor warranty; 6-month galvanic sensor warranty
 
For a user-replaceable (detachable) cable alternative, YSI offers the Pro20 handheld with various BOD probe and DO assemblies.
Please visit our extensive dissolved oxygen resource page to learn about DO and BOD-related things: www.YSI.com/weknowDO.
You can also download The Dissolved Oxygen Handbook, which covers all things DO-related, from technologies to maintenance and calibrations to acquiring the best data.