YSI Professional Series Pro20i Dissolved Oxygen Instrument

Ref: YSI-607130
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  • Collections: Probes & Parameter Meters, YSI

    Vendor: YSI

    Shipping Weight: 2.0 lb

    Dissolved oxygen and temperature handheld instrument with integral (i.e. non-detachable) cable. The Pro20i is a direct replacement for the model 55 and 550A dissolved oxygen instruments. EPA approved for wastewater compliance reporting of DO.

    Easy to use, rugged and reliable, the YSI Pro20i provides everything you need in a handheld instrument for the measurement of dissolved oxygen. User-friendly and convenient calibration routine and 50 data set memory. A true field instrument with IP67 waterproof, rubber over molded case, and 1-meter drop tests ensure durability to provide years of sampling even in the harshest field conditions.


    • Integral (i.e. built-in) cable with 1 m, 4 m and 10 m field cable; user-replaceable DO sensors.
    • One Touch Cal allows for easy DO calibrations within 3 seconds with the press of a button. Automatic barometric pressure compensation.
    • Quick response times; 95% response time in approximately 8 seconds with standard membrane (fastest response time on the market).
    • Stores 50 data sets; no need to write down data.
    • Large graphic, backlit display and glow in the dark keypad.
    • A true field instrument - the display is visible when wearing polarized sunglasses.
    • Tough. IP-67, impact-resistant, waterproof case. Waterproof with and without the battery cover.
    • Rubber over molded case provides extra durability.
    • Multiple languages: English, Spanish, French, and German.
    • 3-year instrument; 2-year integral cable; 1-year polarographic sensors; 6-month galvanic sensor warranty.

    The Pro20i features an integral cable, but the Pro20 features a user-replaceable (i.e. detachable) cable. Longer cables are also available for the Pro20, as is a BOD probe/cable assembly.