55 Dissolved Oxygen Instrument

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.

PriceDiscontinued

Option

SKU055200


The YSI model 55 dissolved oxygen and temperature handheld instrument has been discontinued. YSI will continue to support existing model 55’s through 2020. We recommend the YSI Pro20i as a direct replacement. The Pro20 and ProODO handheld instruments are also suitable replacements. See the Pro Series Guide for discontinued YSI handheld instruments and their replacements.

  • Overview

    Offering push-button calibration with a built-in calibration chamber, direct salinity, and altitude compensation, the YSI 55 provides simultaneous readings of oxygen and temperature.

    Dissolved oxygen readings are automatically compensated for temperature.

    Features:

    • Large, backlit display
    • 12, 25, or 50 foot cables
    • IP-65 water tight
    • Low-battery indicator
    • CE compliant

    Includes: Instrument, attached cable, probe, and a 5775 Membrane Kit

  • Specifications
    Certifications IP-65 (water resistant), CE compliant
    Graphic Display Graphic, backlit display
    Logging Capabilities Single
    Measurement Range Dissolved Oxygen-0 to 200% air saturation/0 to 20 mg/L, Temperature--5 to 45°C
    Parameters Measured Dissolved Oxygen, Temperature
    Power 2 alkaline C-cells provide 400 continuous hours at ambient temperature without backlight
    Sampling Yes
    Unit of Measure Temperature-°C, mg/L, Dissolved Oxygen-% air saturation
    User Calibratable Yes
    Warranty 2-year instrument
    Waterproof IP-65 (water resistant)
  • Accessories

    Membrane Kit, Standard, includes electrolyte (1 mil)

    Membrane Kit, Standard, includes electrolyte (1 mil)

  • Video

    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.

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