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Ohaus ST20D Dissolved Oxygen Water Analysis Pen Meter | Cambridge Environmental

SKU: ST20D~ea

SKU: ST20D~ea

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Putting accurate electrochemistry measurement into your hands! This dissolved oxygen pen meter features easily replaceable electrodes, and an automatic shut off feature - providing you with longevity of this instrument.

Simple operation in a slim and portable design, this pen meter has many applications:

  • pH
  • oxidation-reduction potential (ORP)
  • conductivity
  • dissolved oxygen (DO)
  • salinity
  • total dissolved solids (TDS)
  • temperature measurement


  • Measurement Range: 0.0 to 19.9 mg/L
  • Resolution: 0.1 mg/L
  • Accuracy: ± 0.5 mg/L
  • Dimension: 185 mm x 42 mm x 37 mm
  • Weight: 90 g
  • Materials: ABS

Download(s) Available: Starter Pen Meters Literature
Download(s) Available: ST20D Manual