Pro20 Dissolved Oxygen Meter

Pro20 Dissolved Oxygen Instrument

YSI Pro20 dissolved oxygen meter. This dissolved oxygen instrument is designed tough enough for the field and smart enough for the lab conducting BODs.

Model 55, Pro20, and Pro20i Dissolved Oxygen Meter Comparison

The YSI Model 55 dissolved oxygen handheld was an extremely popular meter for YSI customers. Since it's discontinuation we've launched a few models to easily replace the Model 55 with much better benefits. This video compares the Model 55 to its direct replacement - the YSI Pro20i (https://www.ysi.com/pro20i) - and reviews improvements and features of the Pro20i. The Pro20 (https://www.ysi.com/pro20) is also reviewed, although it has a user-replaceable cable unlike the Pro20i and Model 55.

Price$738.00 (US Only)

SKU6050020


In Stock 66

The Pro20 provides everything you need in a handheld dissolved oxygen meter. Ruggedness, simplicity and reliability are the cornerstones of the instrument's design. Available sensors are EPA approved for wastewater compliance reporting of BOD, CBOD, and DO.

Instrument Only.  Cables, probes/sensors, and accessories sold separately.

  • Order Meter
    SKU Description Price Quantity
    6050020 Pro20 $738.00
  • Order Cables
    SKU Description Price Quantity
    605780 ProBOD - Pro Series BOD Probe $910.00
    60520-1 Pro Series DO Cable - 1 m $312.00
    60520-4 Pro Series DO Cable - 4 m $332.75
    60520-10 Pro Series DO Cable - 10 m $395.25
    60520-20 Pro Series DO Cable - 20 m $468.00
    60520-30 Pro Series DO Cable - 30 m $598.00
    60520-100 Pro Series DO Cable - 100 m $941.25
  • Order Sensors
    SKU Description Price Quantity
    605203 2003 - Pro Series Polarographic Dissolved Oxygen Sensor $229.00
    605202 2002 - Pro Series Galvanic Dissolved Oxygen Sensor $229.00
  • Order Accessories
    SKU Description Price Quantity
    605306 5908 - Replacement Standard Membrane Kit for 605203 Polarographic DO sensor $79.25
    603075 3075 - Pro Series Soft Sided Carrying Case $160.50
    603077 3077 - Flow Cell Kit, 1 or 2 Port Sensor $494.50
    603070 3070 - Shoulder strap $39.25
    EWPRO20 Extended Warranty PRO20 $110.00
    605913 5913 - Replacement Standard Membrane Kit for 605202 Galvanic DO sensor $81.25
    603074 3074 - Pro Series Hard Sided Carrying Case $371.00
    603162 6262 - Pro Series Soft Sided Small Carrying Case $116.50
Add to Cart
  • Overview

    The YSI Pro20 dissolved oxygen meter is a rugged, user-friendly instrument for dissolved oxygen measurement. The Pro20 can be used in the lab or the field and can go from one to the other in seconds.

    User-replaceable sensors and cables and convenient One Touch Cal feature makes it extremely user friendly. 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.

    Additional features include:

    • 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
    • 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

    Lab or field - the Pro20 is ready for whatever you need when it comes to oxygen meters.

    When ordering the YSI Pro20 you must order the instrument, cable, and dissolved oxygen probe separately, allowing you to choose the system that best fits your application.

    YSI now offers an Extended Warranty for the Pro20 (new instruments only).

    Please visit the Pro20 Kits page for fully assembled systems.

    Check out the ProSolo if you're interested in an optical dissolved oxygen instrument.

    The Pro20i is also available from YSI. Unlike the Pro20, the Pro20i features an integral (i.e. not user-replaceable) cable.

    Please visit our extensive dissolved oxygen resource page to learn about all things DO and BOD related; www.YSI.com/weknowDO.

    You can also download The Dissolved Oxygen Handbook covering all things DO related from technologies, to maintenance and calibrations, and acquiring the best data.

  • Specifications
    Certifications IP-67, RoHS, Assembled in USA, CE, 1-meter drop test, WEEE
    Connector MS (military spec) waterproof with bayonet lock
    Digital / Digital Sensors Analog
    Equipment used with ProSeries 20-x cables, ProBOD
    Graphic Display backlit display AND keypad, Graphic display with detailed Help
    Languages English, Spanish, French, German
    Logging Capabilities Single
    Measurement Range

    0 to 500%; 0 to 50 mg/L

    Memory 50 data sets
    Multiparameter Yes
    Parameters Measured Temperature, Dissolved Oxygen, Built-in barameter
    Power 2 alkaline C-cells provide 450 continuous hours at ambient temperature without backlight
    Sampling Yes
    Unit of Measure air saturation, mg/L, Barameter-mmHg, °F, Temperature- °C, Dissolved Oxygen-%
    User Calibratable Yes
    User Replaceable Yes
    Warranty 3-year instrument; 2-year field cables
    Waterproof floats, IP-67 (even with the battery cover off)
  • Accessories

    Pro Series Dissolved Oxygen/Temperature Field Cable

    YSI 20 Cable - DO and temperature cable assembly

    Pro Series Galvanic Dissolved Oxygen Sensor

    YSI 2002 Galvanic Dissolved Oxygen sensor for the Pro Series

    Pro Series Polarographic Dissolved Oxygen Sensor

    YSI 2003 Polarographic Dissolved Oxygen sensor for the Pro Series (Yellow Membrane Kit)

    Flow Cell Mounting Spike

    Flow Cell Mounting Spike

    Flow Cell, Standard, 203 mL

    Flow Cell, Standard, 203 mL

    Cable Management Kit

    Cable Management Kit

    Belt Clip

    Belt Clip

    Pro Series Hard Sided Carrying Case

    Carrying Case, Hard Sided

    Pro Series Soft Sided Carrying Case

    Carrying Case, Soft Sided

    Flow Cell, Extended Length

    Flow Cell, Extended Length

    Tripod Clamp

    Tripod Clamp

    Cap Membrane Kit 2.00 Mil PE

    Cap Membrane Kit 2.00 Mil PE (6 each), includes electrolyte (blue cap)

    Cap Membrane Kit 1.25 Mil PE

    Cap Membrane Kit 1.25 Mil PE (6 each), Galvanic, includes electrolyte (yellow cap)

    Cap Membrane Kit 1.25 Mil PE

    Cap Membrane Kit 1.25 Mil PE (6 each), Polarographic, includes electrolyte (yellow cap)

    Weight, Probe/Cable, 4.9 oz

    Weight, Probe/Cable, 4.9 oz

    Shoulder Strap

    Shoulder Strap

    Pro Series Lab Dock

    Pro Series Lab Dock

    Pro Series BOD Probe

    Self-stirring BOD probe for use with the Pro20 and Pro Plus

    Extended Warranty Pro20

    One Year Extended Product Warranty for Pro20

  • How to Order

    Step 1: Order Instrument

    SKU Description
    6050020 Pro20 Handheld instrument

    Step 2: Order Cable(s)

    SKU Description
    60520-1 1-m cable for DO/temp
    60520-4 4-m cable for DO/temp (includes cable management kit)
    60520-10 10-m cable for DO/temp (includes cable management kit)
    60520-20 20-m cable for DO/temp (includes cable management kit)
    60520-30 30-m cable for DO/temp (includes cable management kit)
    60520-100 100-m cable for DO/temp

    Step 3: Order Sensor(s) and Probe(s)

    SKU Description
    605780 Self-stirring BOD probe with 2-m (6 ft.) cable included
    605202 Galvanic Sensor for any cable
    605203 Polarographic Sensor for any cable
  • Video

    Pro20 Dissolved Oxygen Instrument

    YSI Pro20 dissolved oxygen meter. This dissolved oxygen instrument is designed tough enough for the field and smart enough for the lab conducting BODs.

    Model 55, Pro20, and Pro20i Dissolved Oxygen Meter Comparison

    The YSI Model 55 dissolved oxygen handheld was an extremely popular meter for YSI customers. Since it's discontinuation we've launched a few models to easily replace the Model 55 with much better benefits. This video compares the Model 55 to its direct replacement - the YSI Pro20i (https://www.ysi.com/pro20i) - and reviews improvements and features of the Pro20i. The Pro20 (https://www.ysi.com/pro20) is also reviewed, although it has a user-replaceable cable unlike the Pro20i and Model 55.

  • Reviews
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You may also need

Pro Series Dissolved Oxygen/Temperature Field Cable

YSI 20 Cable - DO and temperature cable assembly

$312.00 - $941.25

Pro Series Polarographic Dissolved Oxygen Sensor

YSI 2003 Polarographic Dissolved Oxygen sensor for the Pro Series (Yellow Membrane Kit)

$229.00

Pro Series BOD Probe

Self-stirring BOD probe for use with the Pro20 and Pro Plus

$910.00

Extended Warranty Pro20

One Year Extended Product Warranty for Pro20

$110.00

Pro20 Kits

Choose from 7 different Pro20 Lab / Field Dissolved Oxygen kits

$1,409.25 - $2,386.75

Pro Series Soft Sided Carrying Case

Carrying Case, Soft Sided

$160.50