Buy or Rent YSI Pro 20 Dissolved Oxygen Meter, Polarographic

The Pro20 provides everything you need in a handheld dissolved oxygen meter. Ruggedness, simplicity and reliability are the cornerstones of the instrument’s design.


  • Buy
  • Rent
  • 1M
  • 4M
  • 10M
  • 20M
  • 30M
  • 100M
  • Rental Kit
SKU: 0430.04.05 Categories: ,
  • Internal barometer for highest accuracy
  • Choose field DO sensors (Polarographic or Galvanic) or lab BOD probe for BOD in wastewater
  • One Touch Cal calibrates within 3 seconds with the push of a button
  • Stores 50 data sets
  • Graphic, backlit display and glow in the dark keypad
  • Available with 1, 4, 10, 20, 30 or 100-meter cables (20 meter cable available for rental)
  • View display with polarized sunglasses on
  • Fastest response time on the market with 95% response in 8 seconds with standard membrane
  • Multiple languages include English, Spanish, French and German
  • User replaceable sensors and cables
  • 3-year instrument; 2-year cable warranty
  • Groundwater
  • Wastewater
  • Aquaculture
  • Surface water

Pro20 Instrument General Specifications

BarometerBuilt-in barometer
Cable Lengths*1- 4- 10- 20- 30- and 100-m lengths (special order up to 100-m)
(3.28, 13.1, 32.8, 65.6, 98 ft.)
CertificationsRoHS, CE, WEEE, IP-67, 1-meter drop test
ConnectorMS (military spec) waterproof with bayonet lock
Data Memory50 data sets
Dimensions8.3 cm width x 21.6 cm length x 5.6 cm depth (3.25 in x 8.5 in x 2.21 in)
LanguagesEnglish, Spanish, German, French
Power2 alkaline C-cells providing 450 hours of battery life;
low battery indicator
Salinity Input Range0-70 ppt; manual (automatically compensates for manual input value)
Warranty3-year instrument; 2-year cable; 1-year Polarographic sensors; 6-months Galvanic sensors
WaterproofIP-67 (even with the battery cover off)
Weight with Batteries475 grams (1.05 lbs)

Product Manual (PDF)
Quickstart Guide (PDF)
Specifications (PDF)

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