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    The 550A also has a built-in calibration chamber, low-battery indicator, direct salinity, and altitude compensation. It will calibrate in % or mg/L saturation and displays temperature in user selected degrees C or F.

    The DO electrode is easily field replaceable, and the replacement membranes are built into screw-on caps.

    Battery life is rated at 2,000 hours. Special 3-year warranty on meter and 1-year warranty on sensor.

    The YSI 550A meter is waterproof, rugged, and reliable Dissolved Oxygen Meter. It allows simultaneous measurement of dissolved oxygen and temperature and features a backlit display, automatic push-button calibration, and a weighted, quick-sinking probe. 

    Item # Description/Size Availability Qty Break Price Quantity
    WQM280-012
    YSI 550A Meter & Probe: Dissolved Oxygen w/ 12 ft cable
    In Stock 1 $875.00
    WQM280-025
    YSI 550A Meter & Probe: Dissolved Oxygen w/ 25 ft cable
    In Stock 1 $920.00
    WQM280-050
    YSI 550A Meter & Probe: Dissolved Oxygen w/ 50 ft cable
    In Stock 1 $975.00
    WQM280-100
    YSI 550A Meter & Probe: Dissolved Oxygen w/ 100 ft cable
    In Stock 1 $1,030.00