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Used YSI Model 550 Handheld Dissolved Oxygen Meter Details van manufacturer: Range 0 to 500% air saturation Resolution 0.1% air saturation or 1% selectable Accuracy 0-200% : ±2% air sat. or ±2% of reading whichever is greater 200-500% : ±6% of reading Dissolved Oxygen Sensor Steady-state polarographic Dissolved Oxygen Probe Field-replaceable module Temperature Units Celsius or Fahrenheit user selectable Nee Merk: YSI Type: 550A