YSI Model 55

Handheld DO Meter

The YSI 55 is handheld, accurate, and an industry standard for field DO measurements. The large, backlit, LCD display simultaneously reads temperature and dissolved oxygen in either % saturation or mg/L. Calibration is easily performed using the built in probe storage chamber. Accuracy is increased by automatic temperature compensation and manual corrections for salinity and altitude.

YSI’s new handheld DO meter, the Pro20, is the suggested replacement for the YSI 55.

The YSI 55 is accurate to within 2 % saturation or .3 mg/L with a range of 0 to 200% saturation and 0 to 20 mg/L. The housing is IP65 rated water resistant and self diagnostics are ran at each startup to confirm proper operation. The probe features a stainless steel body to add both durability and act as a weight. Rugged and field ready, the YSI 55 is availble with built in cables in lengths of 12, 25, and 50 feet, or as a detachable cable version. Power is provided by 6 AA alkaline batteries (included), which can operate the instrument for up to 100 hours.

YSI 55 Handheld DO Meter Features

  • Automatic temperature compensation
  • manual salinity and altitude compensation
  • Large display with backlight
  • Cables in lengths up to 50 ft
  • Water resistant casing (IP-65)
  • 2 year warranty

YSI 55 Handheld DO Meter

Call to Order
1-888-234-5678

Part No. Description Price
055200 YSI 551, 12′ cable $775.00 $736.25
055225 YSI 551, 25′ cable $815.00 $774.25
055250 YSI 551, 50′ cable $905.00 $859.75

YSI 55 Replacement DO Probe Membranes

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1-888-234-5678

Part No. Description Price
098094 Replacement Membranes1 for YSI 55, 1.00 Mil $32.00 $30.40

YSI 55 Accessories

Call to Order
1-888-234-5678

Part No. Description Price
005520 Carrying case for YSI 551, small hard sided $49.00 $46.55
050500 Carrying case for YSI 55, hard sided $250.00 $237.50

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