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Observator 100 years

YSI Pro20 Handheld Dissolved Oxygen Meter

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

User-replaceable sensors and cables and convenient one touch cal feature makes it extremely userfriendly. Mil-spec (military spec) connectors, IP-67 waterproof and rubber over molded case, and 1-meter drop tests ensure the instrument remains in your hands to provide years of sampling, even in the harshest field conditions. The feature set of the Pro20 results in a low total cost of ownership over the life of the product.

Fast response times with the polarographic or galvanic dissolved oxygen sensors allow you to complete your sampling routine quickly. The long life of the polarographic sensor saves time and money and reduces your overall cost. The galvanic sensor enables you to start sampling immediately without a warm-up period. Either sensor you choose for the field will give you accurate, quality data.


Dutch market only
Please be informed that we – as a reseller – are only allowed to sell/deliver Xylem/YSI and Xylem/SonTek products to the Dutch market.


Additional documents


  • 3-year instrument; 2-year cable warranty
  • User-replaceable cables and sensors
  • Choose polarographic or galvanic for the field or a self-stirring BOD probe for the lab
  • One touch cal allows easy DO calibrations within 3 seconds with the press of a button
  • Automatic barometric pressure compensation
  • Stores 50 data sets; no need to write down data
  • Graphic, backlit display and glow in the dark keypad
  • Available with 1- 4- 10- 20- 30- and 100-m cable lengths standard (special order up to 100-meter cables in 10-meter increments)
  • Tough, IP67, impact-resistant, waterproof case even without the battery cover
  • Rubber over molded case provides extra durability
  • Military spec connectors
  • A true field instrument – the display is visible with polarised sunglasses on
  • Quick response times; 95% response time in approximately 8 seconds with standard membrane (fastest response time in the market)
  • Multiple languages include English, Spanish, French, and German


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