Starting at $1,092.00
  • Usually ships in 4 weeks



  • 1, 4 or 10m cable lengths available
  • Dissolved oxygen ranges:
    • 0 to 500% saturation
    • 0 to 50 mg/L
  • 23 to 131°F (-5 to 55°C) temp range
  • 400 to 999.9 mmHg barometer range
  • IP-67 waterproof
  • User replaceable DO sensors
  • One touch calibration
  • Automatic barometric pressure compensation
  • Quick response times
  • Stores 50 data sets


The YSI Pro20i Dissolved Oxygen Meter provides everything you need in a handheld instrument for the measurement of dissolved oxygen (DO). A true field instrument with IP-67 waterproof, rubber over molded case, military spec connectors and 1-meter drop tests ensure durability to provide years of sampling even in the harshest field conditions. The Pro20i can easily be calibrated for fast, accurate measurements.