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YSI™ Model 550A Dissolved Oxygen Meter

Rugged DO Meter designed for the field

Manufacturer: ysi™  YSI550A100

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Catalog No. 13-298-116


Description & Specifications


Includes Meter, DO/temperature probe, 4 C Batteries, Cable
Sensor Types Thermistor
Resolution (Temperature) 0.1°C
Accuracy (Temperature) ±0.3°C
Battery Life 2000 hr.
Battery Type C Alkaline
IP Rating 67
Certifications/Compliance CE, IP67
Weight (English) 2 lb.
Weight (Metric) 0.91kg
Accuracy (DO) 0 to 20mg/L, ±0.3mg/L or 2% of reading, whichever is greater, 20 to 50mg/L, ±6% of reading
Dimensions (L x W) 9 x 4.75 in. (23 x 12cm)
For Use With (Application) DO, Temperature
Height (English) 2.5 in.
Length (English) 9 in.
Length (English) Cable 100 ft.
Length (Metric) 23cm
Range (DO) 0 to 50mg/L
Resolution (DO) 0.01, 0.1mg/L
Saturation Range 0 to 500% Air Saturation
Saturation Resolution 0.1% Air Saturation
Temperature (English) Range 23° to 113°F
Width (English) 4.75 in.
Width (Metric) 12cm
Warranty 3 Years

  • Accurate measurement of dissolved oxygen and temperature simultaneously
  • Waterproof, impact-resistant case
  • Innovative field-replaceable DO electrode with screw-on cap membranes
  • Quick sinking, weighted probe
  • Large easy-to-read backlit display
  • Features calibration in % and mg/L, altitude and temperature compensation, and a low battery indicator